tag:blogger.com,1999:blog-258267082024-03-13T19:59:45.714-07:00LED Grow Lights - Solid State Grow LightingLED Grow Light | LED Plant Lights | Solid State Plant Light | LED Grow Lighting | LED Light BulbsLed Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.comBlogger44125tag:blogger.com,1999:blog-25826708.post-90998212152724074742009-11-18T20:06:00.000-08:002009-11-18T20:22:21.144-08:00Top Ten LEDs and LED Grow LightsRecently the <a href="http://ledgrowlights.blogspot.com">LED Grow Lights</a> market has seen a greater interest in using White HB (High Brightness) LEDS to round out and fill in gaps of spectrum that are missing within the heavily weighted red/blue fixtures that are currently available. Here is a blurb on the LED industries latest favorite white LEDs and how they are being used.<br /><br /><blockquote>Those looking for the best LEDs to use in their lighting devices have been given a helping hand through a list compiled by one expert.<br /><br />Richard Wilson, editor of ElectronicsWeekly, included brands such as Bridgelux, Cree, Enfis, Philips and Osram in his top ten.<br /><br />Mr Wilson favoured the Cree LRP-38 LED for its high colour-rendering index of 92, which puts it on a par with incandescent alternatives, and the Osram Parathom Classic, reportedly the first suitable for replacing a 40W bulb.<br /><br />Philips Lumileds Altilon LED bulb was also recommended for those needing automotive headlights – it is currently used by Audi for high and low beams in its R8 model and reaches more than 850 lumens.<br /><br />Other mentions went to the Seoul Semiconductor Z1 LED, the Marl 742 series and the Tyco TYC06-09.<br /><br />Volkswagen exhibited its new L1 concept car at the Frankfurt International Motor Show this week, which is equipped with Osrams Joule JFL2 LEDs for its front headlights.<br /><br />Rapid Electronics is a leading UK supplier of LED products and optoelectronic components for industrial, educational and consumer applications.</blockquote><br /><br />Now fire up those trusty soldering irons and build another <a href="http://ledgrowlights.blogspot.com">LED Grow Light</a> prototype for the gipper!Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-26574397502321376242009-10-02T22:57:00.000-07:002009-10-02T23:02:14.948-07:00LED power management panel discussion questions neededJust doing my part to help everyone along :)<br /><br /><span style="font-weight:bold;">Help me find good questions for the LED power management panel discussion</span><br /><br />In the rush to embrace LEDs as the Great Hope for energy-efficient lighting, it’s easy to forget that LEDs themselves are only part of the design equation: The power control electronics are vital components in ensuring both power efficiency and thermal performance for lighting.<br /><br />We’re having the lunchtime panel discussion that features many of the significant players in LED power management ICs**. I’d like to lead off with some questions that will both spark a good discussion among the panelists, as well as take advantage of the wide variety of experience and design approaches represented on the panel. For example, a softball question might be, “When designing a triac-dimmable LED light, what are the most important features the driver IC should have?” Or, “Are there any gotchas in driving the LED that will affect the life of the LED or light quality?”<br /><br />Any suggestions?<br /><br />Or, <a href="http://bit.ly/1k4bIR">register here</a> and ask the questions yourself next Tuesday, October 6, at EDN’s “Designing with LEDs” Workshop in Chicago. (Registration is free.)<br /><br />** Panelists are:<br /><br />Peter Green, Senior Lighting Systems Engineer, International Rectifier<br /><br />Bobby Wong, technical marketing engineer, NEC<br /><br />Michael Pena, Senior Director, Technical Support and Applications, NXP<br /><br />Vipin Bothra, Application Manager, Power Supply Applications, STMicroLed Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-58817604588653542522009-06-30T12:11:00.000-07:002009-06-30T12:27:19.539-07:00Smallest 3-Watt Miniature High Brightness LEDs<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.avagotech.com/cs/Satellite?blobcol=urldata&blobheader=image%2Fjpeg&blobkey=id&blobtable=MungoBlobs&blobwhere=1210912850643&ssbinary=true"><img style="float:right; margin:0 0 10px 10px;cursor:pointer; cursor:hand;width: 175px; height: 120px;" src="http://www.avagotech.com/cs/Satellite?blobcol=urldata&blobheader=image%2Fjpeg&blobkey=id&blobtable=MungoBlobs&blobwhere=1210912850643&ssbinary=true" border="0" alt="" /></a><br />Avago Technologies Announces One of the Industry’s Smallest 3-Watt Miniature High Brightness LEDs for Use in Solid-State Lighting Applications<br /><br />New Competitively Priced LED Features Small Footprint, Robust Package Design, High Flux Output, and Extended Operating Life <br /><br />Avago Technologies, a leading supplier of analog interface components for communications, industrial and consumer applications, today announced one of the industry’s smallest high-brightness 3-Watt LEDs for use in a wide range of solid-state lighting applications. With dimensions of 5 mm by 4 mm by 1.85 mm thick, Avago’s new compact 3-Watt (3W) ASMT-Jx3x is packaged in a small outline package (SOP) and capable of being driven to up to 700 mA to provide high flux output performance. Additionally, this compact LED emitter provides a wide viewing angle, has moisture sensitivity level-one (MSL 1) capability, and is very reliable. This competitively priced 3W LED emitter is ideal for use in lighting applications where space is constrained. Typical applications include portable lighting appliances, street lighting, architectural facade lighting, retail display lighting, backlighting and a wide range of specialty lighting applications.<br /><br />Despite its compact size, the ASMT-Jx3x provides a maximum viewing angle of 165-degrees to meet the needs of designers who require good color and light output uniformity in their lighting applications. Avago’s ASMT-Jx3x is a high performance LED designed to handle high thermal and high drive currents. By delivering a high flux output of up to 160 lumens (lm) at 700 mA, this LED features a maximum allowable junction temperature of 135 degrees-C and high Electrostatic Discharge (ESD) resistance of 16 kV which makes this LED insensitive to ESD. As a result, special ESD protection equipment is not required to handle the part during installation. Moreover, this 3W LED is compatible with standard SMT reflow soldering processes and helps lower design cost while providing lighting designers with more freedom and flexibility in designing their applications.<br /><br />Features<br /><br /> * Available in full colors. For example:<span style="font-weight:bold;">Red, Red Orange, Amber, Green, Blue, Royal Blue, Cool White, Neutral White and Warm White colors</span><br /> * Small footprint and low profile<br /> * Silicone encapsulation<br /> * Compatible with reflow soldering processes<br /> * Electrically isolated heat sink<br /> * Long operating life<br /> * Energy efficient<br /> * Low thermal resistance<br /> * Moisture sensitivity: MSL 1<br /> * Pb-Free and RoHS compliant<br /><br />U.S. Pricing and Availability<br /><br /><a href="http://www.avagotech.com/pages/en/leds/high_power_leds/3w_mini_led_emitter/">Avago’s ASMT-Jx3x LEDs</a> are priced at $1.84 each in 1,000 piece quantities. Samples and production quantities are available now through Avago’s direct sales channel and worldwide distribution partners. More information about Avago’s LED products can be found at www.avagotechlighting.com or www.avagotech.com<br /><br />About Avago Technologies<br /><br />Avago Technologies is a leading supplier of analog interface components for communications, industrial and consumer applications. By leveraging its core competencies in III-V compound and silicon semiconductor design and processing, the company provides an extensive range of analog, mixed signal and optoelectronics components and subsystems to approximately 40,000 end customers. Backed by strong customer service support, the company's products serve four diverse end markets: industrial and automotive electronics, wired infrastructure, wireless communications, and consumer and computer peripherals. Avago has a global employee presence and heritage of technical innovation dating back 40 years to its Hewlett-Packard roots.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-84299130874311490412009-06-10T17:38:00.000-07:002009-06-10T17:57:00.827-07:00LED Grow Light at home with PhilipsLooks like the <span style="font-style:italic;">LED Grow Light</span> industry is taking another turn for the better as Philips is willing to embrace Solid State Lighting for Plants.<br /><br />Lets hope(not the koolaid kind) that this <a href="http://ledgrowlights.blogspot.com">LED Grow Light</a> partnership is a step in the right direction.<br /><br /><blockquote>Philips sows seeds for energy-efficient horticulture through LED lighting partnership with BVB Substrates<br /><br />Date Announced: 05 Jun 2009<br /><br />Eindhoven/De Lier the Netherlands – Royal Philips Electronics (NYSE: PHG, AEX: PHI) is to join forces with leading horticultural supplier, BVB Substrates of the Netherlands, to develop solid-state LED lighting-based applications for greenhouse-based flower and vegetable cultivation. The companies have signed a memorandum-of-understanding in order to combine their respective strengths in horticulture.<br /><br />High-tech horticulture production is a highly energy-dependent process, often requiring specialist ‘growth’ lighting to improve crop quality and output, especially during autumn and winter. Through its partnership, Philips and BVB Substrates will identify applications of energy-efficient LED lighting to lower this energy consumption, while at the same time improving the quality and yield of production.<br /><br />BVB Substrates – the corporate brand name of Bas van Buuren B.V., Euroveen B.V and Bogro B.V. - has more than 100 years of experience of driving innovation in substrates, the foundation from which flowers, vegetables, plants, mushrooms, soft fruits and trees are grown. Based in the Netherlands, one of the world’s largest flower-producing economies, BVB Substrates supplies its expertise in substrates to nurseries throughout the world.<br /><br />Contact<br />Simon Poulter, Philips Lighting<br />Tel: +31 651066949<br /><br />E-mail: simon.poulter@philips.com<br /><br />Web Site: www.philips.com</blockquote>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-45814555811937020342009-05-19T14:50:00.000-07:002009-05-19T16:00:01.836-07:00UVB LEDs Can Help Plants Grow Darker<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmKmekfrpXeLbo2maNUNV1j6nedo3iae5h2RJ129iRqYdw0_k3SN8g6mAIFyd1sd3kSb95EsXtaksb7NGJ0tqT9Vo2ex0_O_0hy2zPUw_pnPLjog4weYmTMLm4JDR-yMgSK7nO/s1600-h/lettuce-UVB-LED.jpg"><img style="float:right; margin:0 0 10px 10px;cursor:pointer; cursor:hand;width: 250px; height: 136px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmKmekfrpXeLbo2maNUNV1j6nedo3iae5h2RJ129iRqYdw0_k3SN8g6mAIFyd1sd3kSb95EsXtaksb7NGJ0tqT9Vo2ex0_O_0hy2zPUw_pnPLjog4weYmTMLm4JDR-yMgSK7nO/s400/lettuce-UVB-LED.jpg" border="0" alt=""id="BLOGGER_PHOTO_ID_5337672096732692322" /></a><br />Found an interesting article describing how UVB LEDs are being used for increasing darker pigments in lettuce plants, most may already know that using small amounts of UV LEDs within a <a href="http://ledgrowlights.blogspot.com"><span style="font-style:italic;">LED Grow Light</span></a> design can help with genetic expressionism in many ways- and this only confirms such.<br /><br /><blockquote>Lettuce gets a healthy suntan<br />Ultraviolet LEDs create darker, redder lettuce richer in antioxidants<br /><br />WASHINGTON, May 18-- Salad dressing aside, a pile of spinach has more nutritional value than a wedge of iceberg lettuce. That's because darker colors in leafy vegetables are often signs of antioxidants that are thought to have a variety of health benefits. Now a team of plant physiologists has developed a way to make lettuce darker and redder—and therefore healthier—using ultraviolet light-emitting diodes (LEDs).<br /><br />Steven Britz of the U.S. Department of Agriculture in Beltsville, Md., and colleagues will present the research at the 2009 Conference on Lasers and Electro Optics/International Quantum Electronics Conference (CLEO/IQEC), which takes place May 31 to June 5 at the Baltimore Convention Center.<br /><br />The dark red tinges on a leaf of red leaf lettuce are the plant kingdom's equivalent of suntan lotion. When bombarded with ultraviolet rays from the sun, the lettuce leaf creates UV-absorbing polyphenolic compounds in its outer layer of cells. Some of these compounds are red and belong to the same family that gives color to berries and apple skin. They help block ultraviolet radiation, which can mutate plant DNA and damage the photosynthesis that allows a plant to make its food.<br /><br />Polyphenolic compounds,which include flavonoids like quercetin and cyanidin, are also powerful antioxidants. Diets rich in antioxidants are thought to provide a variety of health benefits to human beings, from improving brain function to slowing the wear and tear of aging.<br /><br />To create red leaf lettuce plants enriched with these compounds, Britz purchased low-power LEDs that shine with UVB light, a component of natural sunlight. In small quantities, this ultraviolet light allows humans to produce vitamin D, which has been cited for its health benefits. Britz exposed the plants to levels of UVB light comparable to those that a beach goer would feel on a sunny day, approximately 10 milliwatts per square meter.<br /><br />After 43 hours of exposure to UVB light, the growing lettuce plants were noticeably redder than other plants that only saw white light. Though the team has yet to quantify this effect, it appears to increase as the intensity of the light increases. The effect also seems to be particularly sensitive to the wavelength used – peaking at 282 and 296 nanometers, and absent for longer wavelength UV. "We've been pleasantly surprised to see how effective the LEDs are, and are now testing how much exposure is required, and whether the light should be pulsed or continuous," says Britz.<br /><br />To cut transportation costs and feed the market in the wintertime, more produce is grown in greenhouses. Crops grown in the winter in northern climes receive very little UVB to begin with, and plants in greenhouses are further shielded from UVB by the glass walls. Ultraviolet LEDs could provide a way to replace and enhance this part of the electromagnetic spectrum to produce darker, more colorful lettuces.<br /><br />Britz also discussed the potential for using UV LEDs to preserve nutrients in vegetables that have already been harvested. Previous experiments have shown that the peel of a picked apple stays redder for a longer period of time when exposed to ultraviolet light. UVB LEDs are a promising technology for irradiating vegetables stored at low temperatures to maintain or even boost the amount of phytonutrients they contain.<br /><br />###<br /><br />Presentation PTuA3, "Shedding light on nutrition," Steven Britz, 10:30 a.m., Tuesday, June 2.<br /><br />ABOUT CLEO/IQEC<br /><br />With a distinguished history as one of the industry's leading events on laser science, the Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference (CLEO/IQEC) is where laser technology was first introduced. CLEO/IQEC combines the strength of peer-reviewed scientific programming with an applications-focused exhibition to showcase the present and future of this technology. Sponsored by the American Physical Society's (APS) Laser Science Division, the Institute of Electronic Engineers (IEEE) Photonics Society and the Optical Society (OSA), CLEO/IQEC provides an educational forum, complete with a dynamic Plenary, short courses, tutorials, workshops and more, on topics as diverse as its attendee base whose broad spectrum of interests range from biomedicine to defense to optical communications and beyond. For more information, visit the conference's Web site at www.cleoconference.org.</blockquote><br /><br />Many have been asking for an update of the <a href="http://ledgrowlights.blogspot.com">LED Grow Light</a> blog and I hope this satisfies!Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-50365941392530934422008-09-26T14:12:00.000-07:002008-09-26T15:26:51.832-07:00Designing LED Grow Lights with a microcontrollerA recent article from <a href="http://www.embedded.com/design/210603186">Embedded.com</a> may help walk DIY <a href="http://ledgrowlights.blogspot.com">LED Grow Light</a> builders through a simple application and design process when using a Microcontroller as a Switch-Mode Power Supply (SMPS). Though not quite as easy as some other <a href="http://ledgrowlights.blogspot.com">LED Grow Light</a> build ups on the internet, this design can be useful for both boost operation or buck-boost operation depending on the LED Grow Light application and LED voltages required.<br /><br /><blockquote>Light-emitting diodes (LEDs) have emerged in recent years as viable sources of light and are no longer used solely as status-light indicators for electronic equipment. Advances in technology have provided LEDs that are typically three times more efficient than incandescent bulbs. LEDs are also extremely durable and have lifetimes exceeding tens of thousands of hours. Power LEDs for lighting applications are designed to be driven with a constant current source. It is common to see standard current drive levels of 350mA and 700mA among different LED manufacturers. <br /><br />The forward voltage across the LED can, however, vary depending on the type and number of junctions connected in series. Many manufacturers of power LEDs will provide multiple junctions, integrated into a single module. <br /><br />One simple method that can be used to drive an LED is to install a resistor, in series, to limit the current. A linear voltage regulator or operational-amplifier (op-amp) circuit can also be connected in a constant-current configuration. However, these linear methods will not have enough efficiency at the required power levels. <br /><br />A Switch-Mode Power Supply (SMPS) provides a much more efficient solution for driving the LED. An SMPS can buck or boost the input voltage to the correct level, to provide the desired LED current. The system input-voltage range and the required LED forward voltage will determine the SMPS topology that is selected. <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2JVHlWJcOGhfGjIBerC1B53i8Cwm_8HvwZD8BFvfHvsJ2MyMoiP2UapFHRQRM15RzJZXfw6SZd2vJZ5wQsmWBrgn8odruinkSAsjc0MDOCJ2zh3_G8q3Bjdb8uDMTcYN_Li9-/s1600-h/LEDBuckBoost.jpg"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2JVHlWJcOGhfGjIBerC1B53i8Cwm_8HvwZD8BFvfHvsJ2MyMoiP2UapFHRQRM15RzJZXfw6SZd2vJZ5wQsmWBrgn8odruinkSAsjc0MDOCJ2zh3_G8q3Bjdb8uDMTcYN_Li9-/s400/LEDBuckBoost.jpg" border="0" alt=""id="BLOGGER_PHOTO_ID_5250455756533215218" /></a>Buck-boost converter<br />The buck-boost converter topology is used when the supply voltage may be above or below the required output voltage and is especially useful for battery applications. This topology is also known as a fly-back or inverting regulator. A buck-boost converter can be implemented as shown in <strong>Figure 1 above</strong>. <br /><br />This implementation has the advantage that a simple, low-side MOSFET driver circuit can be used. The topology shown in Figure 1 will generate a positive voltage, referenced to the input-voltage rail. The downside of this buck- boost implementation is that the load is not referenced to the circuit ground. <br /><br />A simplified circuit design for an LED driver is shown in <strong>Figure 2 below</strong>, using a mixed signal, high voltage 8bit microcontroller, such as Microchip Technology's PIC16HV785. The output of the circuit is referenced to the battery voltage, not to ground. The output of the inverter is connected to the LED anode and produces a voltage that is greater than the input voltage. <br /><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBEVF2F5nv5ttbW3vdpkCMy9G9oiwaNNZI_Us27NqArFxPOrFz8o6gg1DEag-xIYzfwRWDK0CN44leQu185ZrGNadO8PLh6Br5Duq8hehlgUmGIegsRx3qJXt7066OUtv7jIht/s1600-h/LEDdrivercircuit.jpg"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBEVF2F5nv5ttbW3vdpkCMy9G9oiwaNNZI_Us27NqArFxPOrFz8o6gg1DEag-xIYzfwRWDK0CN44leQu185ZrGNadO8PLh6Br5Duq8hehlgUmGIegsRx3qJXt7066OUtv7jIht/s400/LEDdrivercircuit.jpg" border="0" alt=""id="BLOGGER_PHOTO_ID_5250455756206278770" /></a>The PIC16HV785 mixed signal microcontroller combines an 8bit microcontroller core with several on-chip analogue peripherals. These include a high speed, two-phase PWM circuit, ideal for current-mode control of switch-mode power supplies, and two on-chip op-amps that can be used to amplify the voltage across the current-sensing resistors. <br /><br />This allows the use of very small sensing resistors, which reduces circuit losses and increases overall efficiency. The on-chip high voltage shunt regulator eliminates the need for an external 5V regulator when operating from higher supply voltages. <br /><br />The PIC16HV785 also integrates a digital Capture, Compare and PWM (CCP) module, two analogue comparators, a 10bit A/D converter, an 8MHz internal clock circuit, internal precision voltage reference, and a programmable Brown-Out Reset (BOR) circuit. All of the pins of the op amps and comparators are externally accessible, so that any circuit configuration can be implemented. <br /><br />The current-sensing op amp is connected as a differential amplifier, to obtain an accurate measurement of the voltage across the current- sense resistor. The current is measured in the return of the power source, to simplify the requirements of the circuit. R1, R2 and C1 form a low-pass filter to reduce any switching noise that may be present. The cut-off frequency of this filter must be chosen above the converter switching frequency, to avoid limiting the control loop response. <br /><br />Analogue Style Module <br />The two-phase PWM module, an internal comparator and a voltage reference form the circuit that regulates the amount of LED current. The two-phase PWM is an analogue-style module that works on the set/reset principle. <br /><br />First, a clock signal, derived from the system clock, is used to periodically turn on the PWM output. The PWM clock signal sets the fundamental PWM frequency. Then, a reset signal from one of the on-chip comparators turns off the PWM output, when a specified reference level has been reached. <br /><br />The amplified current signal is internally routed to the positive input of Comparator 1 on the PIC16HV785. The Capture-Compare Peripheral (CCP1) on the PIC16HV785 is used in the PWM mode to generate the voltage reference for the comparator. Using the PWM allows fine control of the comparator reference voltage. The PWM signal is filtered with an RC filter to produce an analogue voltage and is connected to the negative comparator input pin. <br /><br />The software for this application is very simple, since the LED current-control function is accomplished in the analogue domain. After all peripherals have been enabled and a current-reference level has been set, the LED will continue to illuminate without software intervention. <br /><br />However, the application code can use the on-chip 10bit A/D converter to measure the supply voltage, which then drives the LED in a constant-power mode. As the battery input voltage changes, a new voltage-reference value is produced by the D/A circuit (implemented with the CCP peripheral) to provide the required compensation. <br /><br />Setting LED brightness<br />Since the microcontroller core is only spending a small portion of time in the power-regulation process, more time can be dedicated to the user interface and to provide additional features, such as battery status monitoring and bright- ness level control. There are two ways that the LED light level can be adjusted using this circuit and software. <br /><br />The first technique relies on the principle that the brightness of the LED will change with the drive current. In fact, an approximate linear control of the LED brightness can be accomplished using this method. However, variable current dimming is not the most efficient way to set the LED brightness level. The LED achieves its best efficiency at the maximum drive-current level specified by the manufacturer. <br /><br />A low-frequency PWM signal of between 60Hz and 1kHz can be used to modulate the LED drive current. Instead of reducing the current drive level, the LED is always driven at maximum current during the on-time. The duty cycle of the PWM signal sets the average amount of time that the LED is energised. <br /><br />The chosen PWM frequency should be sufficiently high so that the LED current is turned on and off at a rate that will not cause the human eye to detect flickering. The PWM frequency must also be low enough so that the current-regulation circuit has enough time to stabilise during the PWM on-time. If these conditions are met, the human eye will average the light output from the LED over time. <br /><br />The PIC16HV785 contains all the required components to implement an efficient <em>high power LED</em> drive circuit. It can be easily configured for boost operation or buck-boost operation, depending on the input voltage range. <br /><br />The application uses only a small portion of the microcontroller's RAM and Flash memory, leaving plenty of room for additional application code. With enough unused peripherals on the PIC16HV785 microcontroller, a second LED driver, battery charger, or other switch-mode circuit can also be implemented.</blockquote><br /><br />If one of the hobbyist readers chooses to build a <a href="http://ledgrowlights.blogspot.com">LED Grow Light</a> using a microcontroller please share your project with the rest of the LED grow light readers here, using your link or comment below.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-65651969578350633932008-09-05T22:17:00.000-07:002008-09-05T23:05:19.145-07:00Future LED Grow Lights use Nanophosphors as Quantum Wells<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8GoRI5NG2e35UpTn3LiC-B0tWdDo3EPZTNFkQxHIwqvWzLNbtYUK2piYEGX9RSxicbPJhaclyxnViuA6aBIy7UrD0wJxZePvKTppSyY_vswd3wQdSeNXQNeRplLqPDMo8blY8/s1600-h/Evidot+LED.bmp"><img style="float:right; margin:0 0 10px 10px;cursor:pointer; cursor:hand;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8GoRI5NG2e35UpTn3LiC-B0tWdDo3EPZTNFkQxHIwqvWzLNbtYUK2piYEGX9RSxicbPJhaclyxnViuA6aBIy7UrD0wJxZePvKTppSyY_vswd3wQdSeNXQNeRplLqPDMo8blY8/s400/Evidot+LED.bmp" border="0" alt=""id="BLOGGER_PHOTO_ID_5242783903294158738" /></a><br />DIY <a href="http://ledgrowlights.blogspot.com">LED Grow Lights</a> of the future may include this new full spectrum technology. Quantum dots are nanoscale semiconductor particles that possess unique optical properties - their emission color can be tuned throughout the visible and infrared spectrum. This means the quantum dot enabled LEDs can emit at almost any color. This provides more color options and better quality white LEDs. <br /><br /><blockquote>Evident Technologies, Inc. of Troy, New York USA, has licensed nanocrystal patents from Philips Electronics. According to Philips, the nanoncrystal technology could pave the way for commercialization of nanocrystal-based LEDs. Evident says that it will use the nanocrystals as a phosphor for its LEDs in a product line that it will launch immediately. The company plans to make LEDs in additional colors that were not previously available. White LEDs use phosphors to convert blue LEDs into white or other colors, Philips says that while the underlying phosphor technology can limit the range of colors that are attainable. According to Philips, the semiconductor nanocrystals do not have these color limitations. Evident actually uses nanocrystal phosphors as quantom wells. These can be tuned to any wavelength of light emission. </blockquote>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-51493935768179286192008-08-12T15:57:00.000-07:002008-08-12T17:55:21.293-07:00Will LED Light Bulbs beat Solid State Lighting Advances?<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi07mXefKG6riZe9_eL2KNcP9y_1tKvubVIDwkxAocqgn_n52_nl7z0xu6pTVIi9LFbnh-Eb7U4iski2QELEXPD6XOoZ2mVlqx-bU_GJ611_4yrYxGYKxiCqRVkdEpR5Fks4dJ0/s1600-h/New+Lighting+Device.jpg"><img style="float:right; margin:0 0 10px 10px;cursor:pointer; cursor:hand;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi07mXefKG6riZe9_eL2KNcP9y_1tKvubVIDwkxAocqgn_n52_nl7z0xu6pTVIi9LFbnh-Eb7U4iski2QELEXPD6XOoZ2mVlqx-bU_GJ611_4yrYxGYKxiCqRVkdEpR5Fks4dJ0/s400/New+Lighting+Device.jpg" border="0" alt=""id="BLOGGER_PHOTO_ID_5233790740609488386" /></a><br />Seems <strike>Matsushita Electric Works</strike> Panasonic announced details of a new <strong><a href="http://ledgrowlights.blogspot.com">solid state lighting</a></strong> product line and the research that surrounds it to the general public during the <a href="http://www.wemif.net/ivnc08">21st International Vacuum Nanoelectronics Conference</a> held in Poland last month.<br /><br />Though the company claims their new silicon light bulb technology might one day be as important as LED and OLED lighting, it appears unlikely as Panasonic's BSD(Ballistic electron Surface-emitting Device)lighting technology doesn't currently have the potential to upset the lead that LED Lighting has, given the usable life (10,000 hours) and lumens per watt (100 lumens per Watt) that the data claims, not to mention the price point for LED Light Bulbs has been falling very fast.<br /><br />This was developed in cooperation with the Graduate School of Engineering at the Tokyo University of Agriculture and Technology, and most likely uses licensed technology from <a href="http://www.groupivsemi.com/">Group IV Semiconductor</a> (in Canada)- which has developed a silicon chip that excites Xenon gas to emit UV light from within the vacuum bulb which in turn causes the phosphor to fluoresce.<br /><br />Any Solid State Lighting technology, Silicon based or otherwise that can push forward <em><a href="http://ledgrowlights.blogspot.com">Solid State Grow Lights</a></em> is always a positive.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-9798639399842051092008-05-01T20:44:00.000-07:002008-05-01T21:26:13.121-07:00LED Grow Lights sprout with Lamina<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjh5ZhzvDUIxr584L-ooLYcWGcKwnG7F9pNuPn9dfcFbjhztBwuUDnCBqGJ6G1l7nRP7rHSPk10x-z2k7at7TgZHAx5MPSf3D2l174kWAZ2yxihDfeJpXHtL9BabUJ_XP2_Sgpn/s1600-h/Lamina+LEDs.jpg"><img style="float:right; margin:0 0 10px 10px;cursor:pointer; cursor:hand;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjh5ZhzvDUIxr584L-ooLYcWGcKwnG7F9pNuPn9dfcFbjhztBwuUDnCBqGJ6G1l7nRP7rHSPk10x-z2k7at7TgZHAx5MPSf3D2l174kWAZ2yxihDfeJpXHtL9BabUJ_XP2_Sgpn/s400/Lamina+LEDs.jpg" border="0" alt=""id="BLOGGER_PHOTO_ID_5195627010474547330" /></a><br />Is it Lamina Solutions Center (LSC) or the Lamina Resource Center? <br /><br />Sure I am a little dazed and confused by the press release from Lamina, either way I felt this was a worthy post for anyone interested in <span style="font-style:italic;">LED Grow Lights</span>.<br /><br /><blockquote> Lamina Resource Center Offers Advanced Tools, Unique Expertise For Customer Product Development Needs<br /><br />Center Offers Advice, Equipment, Design Software, Simulation and Testing of Concepts That Can Flourish with Inclusion of Lamina’s Solid-State LED Technology<br /><br />WESTAMPTON, N.J.--(BUSINESS WIRE)--Lamina Lighting Incorporated (Lamina), an innovator of LED lighting systems and technologies, today announced it has launched the Lamina Resource Center, a unique service that allows customers and potential customers to utilize the company’s specialized expertise and equipment for their own product development purposes. The Center also gives customers the ability to “test-drive” the integration of Lamina’s unique solid-state LED lighting technology into their designs and concepts, giving them a true indication of the product’s enhanced potential through the use of LEDs.<br /><br />“Lamina’s Resource Center is a great way for lighting professionals to see exactly what our innovative technology can do when integrated into their designs,” said Frank M. Shinneman, President and CEO of Lamina. “We have made our specialized equipment and technical expertise available to our customers for use in their concept and product development.”<br /><br />Services offered by the Lamina Resource Center include Proof of Concept Development and Optical Measurement Services. Through the company’s Proof of Concept services, customers can validate the use of Lamina’s LED technology in their applications, either through demos or by actually integrating the technology into existing fixtures to the point of electronics circuit design. This gives customers the resources and confidence to ascertain the appropriateness of solid-state lighting for their application, and take the first step in development to showcase the result of integrating LED technology.<br /><br />Through Lamina’s Optical Measurement Services, customers can take advantage of Lamina’s design and measuring equipment -- some of the most sophisticated in the industry. These devices include high-precision illuminance (lux) meters, LightTools, Zemax and ASAP optical design software, integrating spheres, spectoradiometers, goniometers, luminance meters, and more.<br /><br />Other services offered by Lamina’s Resource Center may include the development of complex custom electronics applications where Lamina’s experienced electronic engineers will utilize the company’s design and simulation tools to assist customers in the development of applications that require in-depth knowledge of communication protocols, microcontrollers, analog power management circuits, and other technologies. Optical Design services would involve implementing a custom optical design then simulating it in order to demonstrate expected results, and then assistance in implementing a final optical solution. Evaluating secondary optics would utilize Lamina’s measurement expertise to assess and characterize the ever-increasing variety of standard optics available, allowing the customer to identify which optic is suitable for their specific application. And finally, the characterization of high-power LEDs can help customers save money by using Lamina’s dedicated light measurement equipment to provide a ample variety of accurate LED measurements, rather than outsourcing the acquisition of this data to a third party.<br /><br />About Lamina<br /><br />Founded in 2001 as a spin-off from the Sarnoff Corporation, Lamina Lighting is at the forefront of global LED research and product development. With its Atlas(tm), Titan(tm) and SoL(tm) Series LED product lines, Lamina provides ultra-high brightness white LED lighting products that satisfy the growing global need to replace conventional lighting with LED technology for general illumination. Among its other benefits, Lamina's environmentally responsive LED technology and programs aid in lowering CO2 emissions-the dominant GHG contributor to global warming. Headquartered in Westampton, New Jersey, Lamina Lighting is funded by five premier technology venture funds. For more, visit www.laminalighting.com .<br /><br />©2008 Lamina Lighting Incorporated. Lamina is a registered trademark and the Lamina logo, Atlas, Titan, TitanTurbo, TruColor, EZ-Connect and SōL are trademarks of Lamina Lighting Incorporated. All other trademarks mentioned are the property of their respective owners. <br /><br />SSPR<br />Belinda Banks, 609-750-9110<br />Belinda@sspr.com<br />or<br />Lamina Lighting Incorporated<br />Dan Polito, Vice President of Marketing<br />609-265-6802<br />dpolito@laminalighting.com</blockquote><br /><br />and for the <span style="font-weight:bold;">LED Grow Light</span> reader that wants it straight and pure:<br /><br /><blockquote>Lamina Solutions Center (LSC)<br /><br />Lamina has developed a solution resource center where our customers receive a high level of technical support with the primary focus being to assist them in developing Lamina-based LED applications.<br /><br />Our LSC is made up of both proof of concept and optical development services. With our proof of concept services customers can now confirm the viability of Lamina technology in their applications. This is typically facilitated via application demos, or by incorporating Lamina LED technology into their electronic circuit designs which can also include their current lighting fixtures. With Lamina’s comprehensive optical services we also offer our customers LED and LED lighting system assessment capabilities. Customers with qualified Lamina LED lighting opportunities can now utilize the knowledge and experience of our SSL engineers, verify designs with our specialized measurement and simulation equipment thereby reducing application development time.<br /><br />Lamina offers qualified customers some of the most specialized measurement, simulation and design equipment available, including:<br /><br />• High precision illuminance (lux) and luminance (nit) meters<br />• Spectroradiometers<br />• Goniometers<br />• Integrating spheres<br />• Zemax™, LightTools™ and ASAP™ optical simulation and design software<br /><br />The breakdown of services that the Lamina Solutions Center offers includes:<br /><br />Lamina Proof of Concept Development Services<br />Our proof of concept services enables qualified customers the opportunity to incorporate Lamina LED technology in their new product designs or by retrofitting their existing lighting fixtures. The confidence gained by this exercise helps to alleviate the uncertainties about the suitability of SSL for their lighting applications. Our LSC can quickly evolve your idea from concept to final product through the use of Lamina LED technology.<br /><br />Specialized Electronics Application Development Services<br />Our team of experienced electronic engineers utilize the most sophisticated design and simulation tools available. Armed with this state-of-the-art equipment and proficiency in electronics, our application engineers counsel our customers in the development of multifaceted and specialized applications – many involving a through understanding of micro-controllers, communication protocols, analog power management circuits, and a host of other technologies.<br /><br />Optical Evaluation, Characterization, Design and Simulation<br />Our optical evaluation service allows accurate characterization and assessment of the ever-growing range of market-available optics thereby enabling our customers to identify which optics are appropriate for their project. Typically our LSC team often performs an optical design and simulation early in the process in order to display probable results. We then corroborate with the customer to execute the final optical solution. This process is best-suited for those customers that have projects which require specific optical design, or those that may not have their own optical engineers or optical design software.<br /><br />Ultra-Bright LED Classification<br />Obviously, LED data is critical when making important design decisions. That said, many customers do not have specialized light measurement equipment internally so they must farm this process out to a coslty third party. Our in-house optics assessment capabilities provides myriad of accurate LED measurements such as CRI, flux, chromaticity, lumen output, radiation patterns, spectral distribution and intensity.<br /><br />Let us help you take the first step to develop a proof of concept to showcase what can be achieved with Lamina-based LED technology. Please contact the Lamina Solutions Center via email at customerservice@laminalighting.com or call us at +1 800-808-5822 (US Toll Free) or +1 609-265-1401 (outside the US).</blockquote><br /><br />---<br /><br />Would love to hear from anyone in the LED Grow Light community who has used or is using the above solid state lighting resources or solutions.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-48242061493641401152008-02-29T00:03:00.000-08:002008-05-03T16:41:56.802-07:00LED Lighting Replacement For Conventional HPS/HID Lights<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4R5W-3z8TTSuKcEc19rO_xSTTMerzc3AkGsuI3YzMc13tTUnXvvhfB-CGrvSa8yS0n7wq4XkHdSKKbHQZA1QUD0IL36AmCkXCQGr8scyETuyLkOdZrHKgonhcre0gvZDcbLeW/s1600-h/LED+Street+Light.jpg"><img style="margin: 0pt 0pt 10px 10px; float: none; cursor: pointer;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4R5W-3z8TTSuKcEc19rO_xSTTMerzc3AkGsuI3YzMc13tTUnXvvhfB-CGrvSa8yS0n7wq4XkHdSKKbHQZA1QUD0IL36AmCkXCQGr8scyETuyLkOdZrHKgonhcre0gvZDcbLeW/s400/LED+Street+Light.jpg" alt="LED Street Light" id="BLOGGER_PHOTO_ID_5172314656148709842" border="0" /></a><br /><span style="font-style: italic;">Though far from an LED Grow Light and not fine tuned for the wavelengths required by plants, this could be a direct solid state lighting replacement for Indoor Gardeners that currently use HID or HPS bulbs.</span><br /><br />After four years of extensive Research & Development, Remco Solid State Lighting Inc., a Toronto, Canada-based SSL Solutions Company, has broken through the barrier to replace conventional street lighting with its recently patented SSL technology and LED-based street light.<br /><br />Its disruptive SSL technology utilizes the dynamic resistance of LEDs providing a LED light engine that is up to 98% power efficient – only a 2% power loss that enables optimal power and LED lighting efficiencies. IES certified photometric lab results and successful pilot field-testing conducted at Camp Borden military base have verified these industry-leading levels of performance.<br /><br />A number of companies have ventured into the LED street lighting market with varying degrees of success. Now, Remco Solid State Lighting has delved into this market utilizing its recently patented power efficient light engine and prototyped an LED Street Light for a truly equivalent LED replacement of the conventional cobra head street light.<br /><br />“Real LED-based lighting application replacements for existing light sources must be direct lighting replacement solutions - lumen for lumen and LUX for LUX, plus offer the benefits of energy savings and reduced maintenance cost," stated Ron Russell, Remco’s CTO and inventor of Remco’s patented LED light engine. Not only is it scaleable to all lighting applications but it also offers a significant competitive advantage in high power LED lighting applications.<br /><br />Conventional street lights typically use a high-pressure sodium bulb. Even non-technical people can see the difference in the picture. The CTO also conveyed that, despite having retrofitted a cobra head street light fixture with Remco’s proprietary thermal management and LED light engine using a stock HPS cobra head lens, Remco’s LED Street Light was able to outperform and produce more light at a greater efficiency than the conventional high-pressure sodium street light.<br /><br />Mark Matthews, Remco's President and CEO stated, “What we strive to achieve with our SSL technology and LED lighting applications is equivalent useable lumens utilizing LEDs to replace conventional lighting with significant energy savings. Our Light engine is up to 98% power efficient and this technology is the key, especially in high power lighting applications."<br /><br />According to Alex Savu, Energy Manager at Camp Borden military base in Canada (where the LED street light pilot test was performed), conventional HPS street lights consume 138 watts (100 watt HPS bulb plus the ballast which consumes an additional 38 watts) and the Remco prototype (a light engine and LED fixture within a cobra head fixture) consumed only 111 watts to generate 4770 useable lumens – a direct lighting replacement.<br /><br />Matthews explained that, “While the test confirms only a 20% energy savings at 40.1 lumens per watt, these results are excellent considering that we have incorporated our LED fixture within a cobra head fixture and lost 20% of the lumens output absorbed by the standard HPS cobra head lens; whereas, we could have generated approximately 5300 useable lumens without the HPS lens.”<br /><br />“When we complete our commercial product to replace all models of 100 watt HPS street lights (Note: the ballast also consumes 38 watts) with our patented LED light engine, proprietary thermal management and optics, utilizing 100 lumens/watt white LEDs, the commercial Remco LED street light luminaire will achieve approximately a 50% energy savings at 72 watts.”<br /><br />It is estimated that there are 50 million 100 watt conventional street lights in North America, and we would like to replace all conventional street lights worldwide with Remco’s energy efficient LED Street Light as a contribution to help reduce Global Warming.<br /><br />Alex Savu reported that since performing the tests, he has seen the superior performance of Remco's LED Street Light. He said, "The light is phenomenal. Basically, it is superior. It looks good!" He explained, "We would have to change our current units ten times before changing one of their units. The way we operate our lights, their units will last 27.4 years." (10 hours per day, seven days per week.)<br /><br />Savu added, "Once we put theirs up, there were no complaints whatsoever." “However,” he said, "most of the other street lights we tested received complaints; either they were not bright enough or there was something wrong with the light."<br /><br />In addition to its power efficient light engine for street lights, the company has developed a fully integrated pendant linear SSL luminaire prototype to replace fluorescent lighting capable of 66% energy savings as well fabricating prototypes of Edison-based LED bulbs with brightness levels equivalent to the incandescent bulbs they replace at energy savings of 85% to 95%!<br /><br />Remco’s new LED light engine technology and SSL luminaires are gaining attention. In 2008 the company was selected as one of Canada’s Top Ten Cleantech technology companies by the Ottawa Centre for Research and Innovation.<br /><br />Remco is on the verge of setting new standards in the Solid State Lighting industry and is currently seeking capital and licensing to major global lighting/fixture organizations and/or international distributors to collectively take a commanding lead in high power LED lighting applications.<br /><br />Photo cutline: Remco’s Bright LED Street Light is in the foreground and conventional HPS street lights in the background.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com1tag:blogger.com,1999:blog-25826708.post-64354470812520144832008-02-28T23:33:00.000-08:002008-05-10T00:15:27.187-07:00GaN Stacked Carbon Film LED Grow Light<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge4sEhh0Ia5DVghN5atB3GCCAwW1waS2dqxOTQ0dtslgByQK8gzgIzZ_WvZzmx40doGHO3r2trkXdyFXUPFOXRKxPCDqfJqdgcPtsUg3x3-p6rxsGJ3yRvV6SpH6GElhXylQW1/s1600-h/Flexible+GaN+LED.jpg"><img style="float:right; margin:0 0 10px 10px;cursor:pointer; cursor:hand;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge4sEhh0Ia5DVghN5atB3GCCAwW1waS2dqxOTQ0dtslgByQK8gzgIzZ_WvZzmx40doGHO3r2trkXdyFXUPFOXRKxPCDqfJqdgcPtsUg3x3-p6rxsGJ3yRvV6SpH6GElhXylQW1/s400/Flexible+GaN+LED.jpg" border="0" alt="GaN on Carbon LED"id="BLOGGER_PHOTO_ID_5172316795042423266" /></a><br /><span style="font-style:italic;">Leave it to the Empire of the Sun to conquer Solid State Lighting, if this ever makes it into the <span style="font-weight:bold;">LED Grow Light</span> market the rays of the rising sun will be upon us all.</span><br /><br />A joint research group announced that they developed a new technique to form gallium nitride (GaN) based LED on a flexible substrate.<br /><br />The group was led by Hiroshi Fujioka a professor at Institute of Industrial Science at the University of Tokyo and the Kanagawa Academy of Science and Technology (KAST). The technique employs a kind of physical vapor deposition (PVD) process, which is suitable for the production of large size LEDs in large quantities.<br /><br />"With this technique, it is highly possible to form, for example, a 1m square GaN LED that emits light from the entire surface at a low cost," Fujioka said.<br /><br />The group has only confirmed emission by "photoexcitation" with the irradiation of UV light on a 2cm square so far, but it is planning to conduct the experiment of emission by electrical excitation, as in the ordinary LEDs, in a few months.<br /><br />Fujioka and others used an "organic polymer sintered graphite sheet (PGS)" for the substrate, instead of a sapphire substrate, which is commonly used in GaN LEDs. PGS is a thin graphite sheet obtained by sintering a sheet of plastic film in an anoxic environment at a high temperature of 3,000°C.<br /><br />The C atoms are bonded together in a hexagonal shape in a planar manner, and this planar structure is vertically stacked to form layers. The graphite sheet is 25-100μm thick. "The surface is flat at the atomic level," Fujioka said.<br /><br />The group formed crystals of GaN and aluminum nitride (AlN) on PGS by using a proprietary PVD process developed by Fujioka and others and found that the crystals thus grown have a superior quality free from defects.<br /><br />"We conducted X-ray analysis and examined the photoexcitation emission spectrum," Fujioka said. "The crystal quality was on par with or even higher than that of commercially available GaN LEDs."<br /><br />The wavelength corresponding to the emission inherent to GaN (3.3eV) is approximately 365nm. But an ordinary GaN has some emission peaks at wavelengths longer than that due to the crystal defects. GaN crystals formed by the latest technology do not have such undesired emission peaks.<br /><br />The PVD process used in the formation of GaN film is called "pulse excitation deposition." It is Fujioka's proprietary technique developed based on a sputtering method used in the production of LCD panels, etc. According to this technique, metal Ga is sublimed by pulse plasma and then subjected to a reaction with nitrogen. The process temperature is reportedly 600-800°C when forming a GaN film.<br /><br />"The technique is applicable to the formation of large films," Fujioka said. "It doesn't take a long time for a manufacturer to make large LEDs."<br /><br />N atoms in GaN bonded to C atoms in PGS<br /><br />According to the group, the key factor that made the formation of high quality GaN crystals on PGS is that the lattice constant of carbon (C) atoms constituting PGS and that of the hexagonal nitrogen (N) atoms in the nitride coincide with each other. Moreover, the C-C bonding in PGS tends to attract and bond N atoms.<br /><br />"First, N atoms are fixed on PGS and then GaN crystals are formed on it," Fujioka said.<br /><br />PGS is "widely used in heat radiation sheets of personal computers, etc because it has a thermal conductivity four times as high as that of copper (Cu) and they are much cheaper than sapphire substrates" (Fujioka). Because it is flexible and thin and has a high heat resistance, large bendable emission sheets as thin as cloth can be produced at a low cost, he said.<br /><br />Gallium (Ga), known as an expensive material, "may only be required in a small amount even for a large film if the sheet is less than 1μm thick," he added.<br /><br />The details of the latest technology will be presented by Fujioka and others at 55th Spring Meeting 2008 sponsored by the Japan Society of Applied Physics, which runs from March 27-30, 2008.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-58282552834710378262008-02-28T21:23:00.000-08:002008-02-28T23:33:55.358-08:00Innovative Ultra-Efficient Polarized LED Wins $30K Prize<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-9v6vRx9YlORcW1uZF2lLE_g-ChsijtWN3goIRJGYkgGyZPSXJY8ZV43hCpV8adnGfzYba2OfvFxYrcUHkBA3BVta1BpQpoYW-LRv6jpe0LCC-PvGdYg6-_CGJW36P_109jw2/s1600-h/Martin+Schubert%27s+Polarized+LED.jpg"><img style="float:right; margin:0 10px 10px 0;cursor:pointer; cursor:hand;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-9v6vRx9YlORcW1uZF2lLE_g-ChsijtWN3goIRJGYkgGyZPSXJY8ZV43hCpV8adnGfzYba2OfvFxYrcUHkBA3BVta1BpQpoYW-LRv6jpe0LCC-PvGdYg6-_CGJW36P_109jw2/s400/Martin+Schubert%27s+Polarized+LED.jpg" border="0" alt=""id="BLOGGER_PHOTO_ID_5172274884751548866" /></a><br />Martin Schubert’s polarized LED could improve LCD displays, save energy<br /><br />Troy, N.Y. — In recent years, light emitting diodes (LEDs) have begun to change the way we see the world. Now, a Rensselaer Polytechnic Institute student has developed a new type of LED that could allow for their widespread use as light sources for liquid crystal displays (LCDs) on everything from televisions and computers to cell phones and cameras. <br /><br />Martin Schubert, a doctoral student in electrical, computer, and systems engineering, has developed the first polarized LED, an innovation that could vastly improve LCD screens, conserve energy, and usher in the next generation of ultra-efficient LEDs. Schubert’s innovation has earned him the $30,000 Lemelson-Rensselaer Student Prize.<br /><br />“In our community of innovators, the Lemelson-Rensselaer Student Prize recognizes our most inspired and dedicated students for their ingenuity and deep understanding of the greater global implications of their innovations,” said Rensselaer President Shirley Ann Jackson. “Martin Schubert is both a talented engineer and inspired entrepreneur. He launched his innovation not only because he had the engineering prowess, but because he also has a remarkable understanding of the technological, environmental, and energy saving outcomes his enlightened innovation will bring. Today we applaud him and the other finalists for their dedication and excellence, and we encourage them to continue to spark informed innovation around the world.”<br /><br />Schubert is the second recipient of the $30,000 Lemelson-Rensselaer Student prize. The prize, which was first given in 2007, is awarded to a Rensselaer senior or graduate student who has created or improved a product or process, applied a technology in a new way, or otherwise demonstrated remarkable inventiveness. <br /><br />For photos and video of the winner and award finalists, as well as a Webcast of the announcement ceremony, please visit: www.rpi.edu/lemelson.<br /><br />The Next Generation of LEDs<br />Schubert’s polarized LED advances current LED technology in its ability to better control the direction and polarization of the light being emitted. With better control over the light, less energy is wasted producing scattered light, allowing more light to reach its desired location. This makes the polarized LED perfectly suited as a backlighting unit for any kind of LCD, according to Schubert. Its focused light will produce images on the display that are more colorful, vibrant, and lifelike, with no motion artifacts. <br /><br />Schubert first discovered that traditional LEDs actually produce polarized light, but existing LEDs did not capitalize on the light’s polarization. Armed with this information, he devised an optics setup around the LED chip to enhance the polarization, creating the first polarized LED. <br /><br />The invention could advance the effort to combine the power and environmental soundness of LEDs with the beauty and clarity of LCDs. Schubert expects that his polarized LED could quickly become commonplace in televisions and monitors around the world, replacing widely used fluorescent lights that are less efficient and laden with mercury. His innovation also could be used for street lighting, high-contrast imaging, sensing, and free-space optics, he said. <br /><br />The Next Generation of Lighting Researcher<br />Schubert is the son of renowned lighting research expert and senior chair of the Rensselaer Future Chips Constellation, E. Fred Schubert. The younger Schubert, who received his bachelor’s and master’s degrees from Cornell University in electrical engineering, was set to pursue a career in computer chip development. But his father quickly identified his skills and ideas for the advancement of lighting technology and recruited him to join the large lighting research effort at Rensselaer.<br /><br />“Martin Schubert has had the opportunity to work in one of the most advanced and well-known lighting research teams in the world,” said Rensselaer Dean of Engineering Alan Cramb. “And Schubert has shown that not only can he keep up in the lab, but he can also independently excel and innovate. His discovery of the first polarized LED marks an important advance in photonics technology that I am sure will resonate in photonics laboratories and companies around the world. Schubert is absolutely a young engineer to watch.”<br /><br />Under the tutelage of his adviser, Michael Shur, the Patricia W. and C. Sheldon Roberts ’48 Professor of Solid State Electronics and director of the Rensselaer/IBM Center for Broadband Data Transfer Science and Technology, Schubert quickly excelled in the field. As soon as he arrived at Rensselaer, he began working nearly independently on his research, using some of the top research equipment available to the constellation, including a cutting-edge clean room laboratory.<br /><br />During his time with Rensselaer Schubert has published three peer-reviewed, archival papers and filed for several patent applications on his polarized LEDs. In addition, Schubert is co-author of 15 other papers on related research, including a paper in one of the top journals in his field, Nature Photonics. The Nature research on the world’s first ideal anti-reflective coating was featured in media outlets around the world, from NPR’s “Morning Edition” to the London Daily Telegraph and Scientific American magazine. <br /><br />Schubert is expected to complete his doctorate in electrical engineering this fall. After graduation he plans to pursue a career in semiconductor devices and photonics. <br /><br />Schubert was born in Germany and grew up in New Jersey and later the Boston area.<br /><br />The Lemelson Program<br />Schubert joins last year’s winner of the Lemelson-Rensselaer student prize, doctoral student Brian Schulkin. Schulkin, who invented the first portable terahertz sensing device, the “Mini-Z”, is currently working on an even smaller device and was recently named to the 2007 Scientific American 50 — the magazine’s prestigious annual list recognizing leadership in science and technology. <br /><br />The $30,000 Lemelson-Rensselaer Student Prize is funded through a partnership with the Lemelson-MIT Program, which has awarded the $30,000 Lemelson-MIT Student Prize to outstanding student inventors at MIT since 1995. More information can be found at http://web.mit.edu/invent/.<br /><br />Timothy Lu, a graduate student in the Harvard-MIT Division of Health Sciences and Technology, is the 2008 winner for the $30,000 Lemelson-MIT Student Prize. Lu has invented processes that promise to enhance the effectiveness of antibiotics and help eradicate layers of bacteria known as biofilms, in order to combat bacterial infections, such as those caused by Escherichia coli biofilms and MRSA (methicillin-resistant Staphylococcus aureus). More information is available on http://web.mit.edu/invent/n-pressreleases/n-press-08SP.html.<br /><br />The University of Illinois at Urbana-Champaign also joined Rensselaer as a new partner institution last year with the announcement of the $30,000 Lemelson-Illinois Student Prize. The winner of the 2008 Lemelson-Illinois Student Prize will be announced during a formal award ceremony on Feb. 28, 2008. <br /><br />On May 26, the winners of all three student prizes will join together at MIT for a discussion and ceremony to honor all of the winners. In June, the winners will take part in the Lemelson-MIT Program’s second annual EurekaFest, a multiday event to celebrate the inventive spirit in Boston and Cambridge, Mass. <br /><br />About the Lemelson-MIT Program<br />The Lemelson-MIT Program recognizes outstanding inventors, encourages sustainable new solutions to real-world problems, and enables and inspires young people to pursue creative lives and careers through invention. Jerome H. Lemelson, one of the world’s most prolific inventors, and his wife, Dorothy, founded the nonprofit Lemelson-MIT Program at the Massachusetts Institute of Technology in 1994. More information is online at http://web.mit.edu/invent/.<br /><br />About Rensselaer<br />Rensselaer Polytechnic Institute, founded in 1824, is the nation’s oldest technological university. The university offers bachelor’s, master’s, and doctoral degrees in engineering, the sciences, information technology, architecture, management, and the humanities and social sciences. Institute programs serve undergraduates, graduate students, and working professionals around the world. Rensselaer faculty are known for pre-eminence in research conducted in a wide range of fields, with particular emphasis in biotechnology, nanotechnology, information technology, and the media arts and technology. The Institute is well known for its success in the transfer of technology from the laboratory to the marketplace so that new discoveries and inventions benefit human life, protect the environment, and strengthen economic development. <br /><br /><span style="font-style:italic;">Naturally I don't want to downplay the achievements or hard work of Mr. Martin's in any way, but looking over the finalists and entries while the watching the webcast of the award ceremony I personally think this prize may have been awarded improperly due to his fathers position at the institute. Though I may be biased in who should have won this award (as with the 2007 finalists; Eben Bayer and Greg Ten Eyck should have split last years prize), it seems many can innovate or build smaller widgets (and help pollute the planet), but few can truly help create a better world in which <a href="http://www.eol.org/">all species</a> may live <a href="http://en.wikipedia.org/wiki/Sustainability">sustainably</a>. Sure the work is great no doubt, but given the speed at which innovation(and the destruction of the planet) is progressing it may be a little late when one looks deeply at the bigger picture that is unfolding for all.</span>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com1tag:blogger.com,1999:blog-25826708.post-12735907466252507392008-02-26T09:51:00.000-08:002008-02-26T12:33:24.810-08:00DIY High Performance LED Lighting SystemLooks like the toadheads have done it again, this time a three (3) part series on on how to build your own DIY LED Lighting System <span style="font-style:italic;">the right way</span> with off the shelf components! - these folks never cease to amaze me with the quality of technical articles published (especially if your an automotive gear head or overall geek like myself). <br /><br />Turn on your LED Night Light and take a peek below!<br /><br />Oh, and if the Jaycar Electronics link within the DIY LED Lighting article doesn't work don't fret it will be live again soon enough. Remember your exchange rate when calculating the actual cost for this project.<br /><br /><span style="font-weight:bold;">Part 1 : http://www.autospeed.com/A_109714/cms/article.html<br /><br />Part 2 : http://www.autospeed.com/A_109715/cms/article.html<br /><br />Part 3 : http://autospeed.com/cms/A_109716/article.html</span><br /><br />Can't wait until these guys find the 15W HB LEDS to play around with.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-31859928567926716802008-01-19T12:03:00.000-08:002008-01-21T17:37:44.589-08:00LED 'Lighting for Tomorrow' Competition 2008<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8GhTr82kpKueaYsCcEkXYPDT0CRINV5G7RDw9Mn9rtjehEMOjvOkZIC_4WkKR364_Mke-724UQco_H5Elgq-Z6Md7GQIx5a7qMMHCideBb3sjVzVaqULA_U0anWTxpwQeZVPa/s1600-h/LED+lighting+for+tomorrow.jpg"><img style="float:right; margin:0 0 10px 10px;cursor:pointer; cursor:hand;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8GhTr82kpKueaYsCcEkXYPDT0CRINV5G7RDw9Mn9rtjehEMOjvOkZIC_4WkKR364_Mke-724UQco_H5Elgq-Z6Md7GQIx5a7qMMHCideBb3sjVzVaqULA_U0anWTxpwQeZVPa/s400/LED+lighting+for+tomorrow.jpg" border="0" alt="Solid State LED Lighting for Tomorrow"id="BLOGGER_PHOTO_ID_5157319739291633554" /></a>Its that time of year again for all of the DIY LED Grow Light Hobbyists to show some Lux, the official LED Lighting for Tomorrow Competition 2008 kicks off and plans on being the biggest yet, last years event attracted over 40 entries in the LED lighting category. If you fancy yourself a budding <a href="http://ledgrowlights.blogspot.com">LED Grow Light</a> specialist this could be your calling, and don't forget the fame and fortune if you win. Realize that the LED Lighting contest is mostly for general illumination which use Ultra-High Brightness (UHB) LEDs, but with a twist as this year a new "Future LED" Showcase category has been added and if an innovative technology entry for an indoor solid state <em>LED plant light</em> were to be received the <a href="http://www.lightingfortomorrow.com/2007/judging_panel.shtml">judging panel</a> wouldn't turn it away and your entry may even help create a new separate category for <em>Solid State Plant Lighting</em> in future LED Lighting Competitions.<br /><br />This years Solid State Lighting (SSL) competition is organized by the U.S. Department of Energy, the American Lighting Association, and the Consortium for Energy Efficiency.<br /><br /><strong>Important Dates</strong> to remember if you plan on entering:<br /><br />January 17-21, 2008 - Lighting for Tomorrow 2008 Competition Launched at the Dallas Lighting Market <br /><br /><strong>February 29, 2008 - <a href="http://www.lightingfortomorrow.com/2008/intent/intent_form.php">Online Intent-to-submit form</a></strong> is due. (I recommend using the <a href="http://www.lightingfortomorrow.com/2008/pdf/2008_ssl_intent-to-submit.pdf">PDF version</a> which is more complete, they ask that you only use one form of submission and both are due by the above date)<br /><br /><strong>April 30, 2008 - All entries due </strong><br /><br />September 14-16, 2008 - Lighting for Tomorrow 2008 Competition Winners Announced at the American Lighting Association Annual Conference<br /><br /><strong>Rules and Entrant Guides:</strong> For complete information on the LED Lighting design contest including applications, competition rules, guidelines, and sponsors visit: <a href="http://www.lightingfortomorrow.com/2008/index.shtml">2008 Lighting for Tomorrow Competition</a><br /><br />Don't forget to take a look at the some of the photos from <a href="http://www.lightingfortomorrow.com/2007/ssl_photos07.shtml">last years winners</a> in the LED Lighting Fixtures (LLF) division for ideas on what the competition is doing with <a href="http://ledgrowlights.blogspot.com">LEDs and Solid State Lighting</a>.<br /><br />This year the LED Lighting Fixtures (LLF) division has three (3) categories: 1) fixtures meeting the ENERGY STAR for solid-state lighting (SSL) requirements, 2) other decorative entries such as chandeliers, sconces, table lamps and portables using LEDs with device efficacy of at least 50 lm/W, and 3) the new "Future LED" category which invites luminaires using the world's highest efficiency LEDs; The “Future LED” category will require a minimum LED device efficacy of 90 lm/W, which would fit the bill nicely for an <em>LED Grow Light</em> entry.<br /><br />LED lighting applications in the 'near term' and 'other lighting' categories include: <br /><br /> Under-cabinet lighting for kitchens<br /> Portable desk/task light<br /> Recessed downlight rated for residential use<br /> Outdoor porch light<br /> Outdoor step light<br /> Outdoor pathway light<br /> Wall sconce<br /> Table or floor lamp<br /> Pendant<br /> Chandelier<br /> Vanity light<br /> Ceiling fan w/ light kit<br /><br />But the 'Future LED Showcase' is wide open with a write-in of your choice, so what will you build next? A rotating LED grow light with LED light arms that track or sweep around for greater coverage could be one idea :)<br /><br />Start up your wire-wrapping grow light engines and lets get this showcase shining!<br /><br />For more information or to ask questions contact: Ruth Taylor, Pacific Northwest National Laboratory - 509-375-2389, ruth.taylor@pnl.govLed Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-58753324231564366532008-01-19T11:05:00.000-08:002008-01-21T05:02:14.884-08:00Strategies in Light Kicks Off 2008 Conference<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUxpIsPHkpGXP8Tnc5uNwPEBn4e83JgHoPL_xOBwCti6OU5gYiqOgMZaQN-j8Zo6X0bsK6QH4wge-KGM5uuNb6vjpcv9rDScT0mnLOZB91be72S_H6msTrYLvWSYYQ7Z6EcMG9/s1600-h/Strategies+in+Light+banner.jpg"><img id="BLOGGER_PHOTO_ID_5157913016009131986" style="FLOAT: right; MARGIN: 0px 0px 10px 10px; CURSOR: hand" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUxpIsPHkpGXP8Tnc5uNwPEBn4e83JgHoPL_xOBwCti6OU5gYiqOgMZaQN-j8Zo6X0bsK6QH4wge-KGM5uuNb6vjpcv9rDScT0mnLOZB91be72S_H6msTrYLvWSYYQ7Z6EcMG9/s400/Strategies+in+Light+banner.jpg" border="0" /></a><div>When it comes to USA-based conferences serving the global LED industry, Strategies in Light defines the space. The consensus here is that by attending the US-based "Strategies" and the Taiwan-based Blue 2008 conference (BlueTaiwan.com) you'll have captured the business heart of the global solid state lighting, LED-lighting and LED industries. There are several good market, business, and technical conferences in the various LED producing countries and regions, including Korea, Japan, China and Europe, and any conference will draw primarily from the country where it is held, but Strategies and Blue do something different, making those two unique.<br /><br />Strategies in Light<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsFPD5luo6TmnDHp1WVUycTBoVryeDu9q986lTdm6aA8ClqjTOZgnB9joeQWRE4aUUIZ1-mB4Os7r1NgRCx8i10StwybukDq5M9kiDPrGCksj9whYwkWyMA3-eG1jyiDWmLCkP/s1600-h/Strategies+in+Light.jpg"><img id="BLOGGER_PHOTO_ID_5157912388943906754" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; CURSOR: hand" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsFPD5luo6TmnDHp1WVUycTBoVryeDu9q986lTdm6aA8ClqjTOZgnB9joeQWRE4aUUIZ1-mB4Os7r1NgRCx8i10StwybukDq5M9kiDPrGCksj9whYwkWyMA3-eG1jyiDWmLCkP/s400/Strategies+in+Light.jpg" border="0" /></a><br />Now in its 9th year, Strategies is by far the largest LED conference, and successfully covers the breadth of the market. Established by Strategies Unlimited, which along with LEDs Magazine is part of PennWell publishing, the conference has kept pace with the growing market, both in its content and attendance. This year is projected to be another record-breaker, with up to 800 attendees and a still larger exhibition compared to last year. Strategies has grown so well and consistently primarily because it has made a quality agenda that matches the needs of today's market the priority. It's easy to throw out the buzz words and fill slots with "somebody", but there is truly an art to creating a neatly segmented, logically flowing 2-day conference that presents the most qualified speakers on the topics at hand. Strategies Unlimited's Dr. Robert Steele, a long time friend of our team, has been the guiding force in defining that agenda each year.<br /><br />Bob is probably the most unassuming industry expert you will ever meet. He has a passion for the industry, and wants it to succeed for all the right reasons. Far from simply being a cheerleader, he brings an intimate knowledge of the overall LED marketplace and is willing to share what he knows, both in the form of his keynote talks, as well as any time you're fortunate enough to be able to engage him in a one-on-one conversation. His experience has been driven as a long-time analyst for the opto-electronic industry, which brought him to the compound semi materials, and subsequently into the application areas they serve. In the late 1990s, as the opto-communications technology was becoming ubiquitous, the LED technologies began to separate themselves as a market in their own right, with the timing of their potential for adoption in general purpose lighting starting to become evident to those that were participating. That opportunity wasn't lost on the team at Strategies Unlimited, and they began to add some additional focus into the LED arena. Interestingly, Jo Ann McDonald, our founding editor at CompoundSemi Online (which later added its Solid State Lighting Net/LIGHTimes arm), was enlisted for her conference and marketing expertise to help implement that new event, suggesting the name "Strategies in Light" in the process. Jo Ann and Bob's collaboration worked, and Strategies set off towards the success that you see today.<br /><br />Perhaps the coolest thing about Strategies is that it has evolved in lock-step with the interests and opportunities of the industry as a whole. Always a west-coast US event, it is located almost exactly mid-way between Asia and Europe, much as the US LED-related market is. Asia has been the historic epi-center in chips, and strong in packaged LED lamps and the earliest mainstream applications, including keypads, handhelds, and display backlighting. Europe has been an hotbed of forward thinking lighting design, laid a lot of the groundwork for automotive applications and was the early champion of OLED technologies. In between are the US and Canada, where you find major chip, lamp and lighting companies, as well as a lot of the IP that makes up today's light engines and control systems. From an original focus on the materials and chips, Strategies has moved up the chain to a focus today on the breadth of applications and industry issues as a whole, with only a few talks on underlying componentry or technology. This is about "the markets" in which high brightness LEDs have and will find their homes.<br /><br />Keynoters this year include Bas van de Kieft, Executive VP of Phillips lighting, who will share his thoughts on some scenarios regarding the penetration of the general lighting market by solid state lighting, and of course, Bob Steele who will be sharing the latest global market report and forecast. Featured speakers from luminaire manufacturers include Bob Smith, Director of Innovation and Advanced Engineering at Cooper Lighting (whose enthusiasm for SSL is extremely contagious) and Liam Kelly, who is managing director at Nualight. At the technology level, we'll be hearing from Bernhard Stapp, VP and GM of SSL at OSRAM Opto Semiconductors on the target markets and status of OLEDs. It's simple... don't miss Strategies.<br /><br />Blue 2008<br /><br />The next "can't miss" on the industry calendar is the Blue 2008 event, returning this year to the attractive Ambassador Hotel in Hsinchu, Taiwan, on May 7-8. Work is underway now to finalize the agenda and speakers, so expect to hear more of those details here in 1-2 weeks. Blue was launched back in 2003, as a celebration of the commercial emergence of the nitride-based blue-spectrum devices, including blue and white LEDs, as well as the blue laser diodes that were to become the heart of the "high def" DVD revolution. When blue and white were added to the existing red and green LEDs, it marked the effective beginning of the LED lighting revolution. In 2004, Blue moved to Taiwan, establishing itself as a leading industry event, with its main focus on the chip and packaged "lamp" level of the LED supply chain. In 2006 and 2007, there was an agenda emphasis on "understanding and meeting the needs of the lighting industry" with the intention to better connect the chip and packaged device producers with the rapidly emerging general lighting markets. For the 2008, it's time for Blue to bring the spotlight back onto the core level of LED innovation at the materials, chip and packaged lamp level. We're pleased to be able to bring Bob Steele and his mid-year global market update to the Asian audience. He'll be joined by Asif Anwar of Strategy Analytics, who will be covering the GaN and materials market developments, along with some related updates including a bit on blue lasers. New with us this year will be Enboa Wu of Hong Kong's research lab, ASTRI for updates on mainland China's programs and progress, and we'll be rejoined by the good folks at Taiwan's Photonic Industry Development Association (PIDA) who will provide local market insights that you don't find anywhere else. Make your plans now.<br /><br />When it comes to conferences, its all about who you'll meet and what nuggets you will carry away that make a difference in your business. Who you'll meet is almost entirely dependent on the quality of the agenda, which, in turn, is driven by the organizer's market knowledge and their integration with the industry (we call it having "skin in the game"). We'll be there, and we look forward to seeing you as well at Strategies and at Blue.</div>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-24135552086920030882008-01-19T10:47:00.000-08:002008-01-19T12:03:31.285-08:00Germany Embraces LED Lighting for Carbon Credits<strong>LEDs Integrated in European Energy Efficiency Program</strong><br /> <br />Major German Utility Company Promotes Energy-Efficient, CO2 Offset-Certified Lamina LEDs to Consumers and Businesses as Replacements for Traditional Lighting Products <br /><br />Lamina Lighting Incorporated (Lamina), an innovator of <a href="http://ledgrowlights.blogspot.com">LED lighting systems</a> and technologies, today announced that the company’s LED lamps will be utilized in an energy efficiency initiative launched by RWE Rhein-Ruhr, the major regional energy company of the RWE Group. RWE ranks among Europe’s leading integrated electricity and gas companies and is one of the largest electricity producers in Germany. <br /><br />The program represents an effort by RWE Rhein-Ruhr to help commercial and residential customers conserve energy and reduce utility bills by replacing their current light sources with Lamina’s SōL™ MR16 LED product, the only LED in the world which carries a CO2 offset certification. <br /><br />“We are very proud that our SōL MR16 LED has been chosen to play a relevant part in the RWE energy efficiency program in Germany,” said Frank M. Shinneman, President and CEO of Lamina. “Working together with RWE Rhein-Ruhr and our partner-distributor Richard Schahl GmbH in Germany, we are happy to help more people become familiar with Lamina’s unique product innovations and efficiencies, and how their use can have a positive effect on the environment in the long run.” <br /><br />RWE is based in Essen, Germany, and through its various regional energy companies and subsidiaries supplies 20 million electricity customers and 10 million gas customers throughout Europe. The LED initiative involves public announcements in the company’s 38 showrooms across Germany, and the distribution of almost 3 million newsletters. The newsletters explain to residential customers the positive aspects of using LED replacements; 56,000 industrial customers will also receive special brochures. Plans are underway for RWE Rhein-Ruhr to work in partnership with Richard Schahl GmbH, the European distributor of Lamina products, to train RWE-certified electricians on the correct and professional installation of the Lamina LED lamps into businesses such as hotels and retail shops, as well as inform them about potential costs and energy savings. All major electrical wholesalers will carry stock for Lamina’s SōL MR16 throughout Germany. <br /><br />Lamina’s SōL MR16 LED product uses less than 8 watts of energy and produces the same amount of light, for a much longer period of time, than a 20 watt halogen light bulb. Lamina labels its SōL product with a “green tag” which highlights the bulb’s energy consumption as compared to its equivalent in the form of carbon credits offset. For the SōL this amounts to approximately ½ of a carbon credit (a carbon credit is equal to the emission of one metric ton of carbon dioxide). SōL’s CO2 offset was certified by an independent third party: The Carbon Credit Company LLC – the U.S. subsidiary of Frankfurt-based 3C Group. Among other services, 3C helps companies like Lamina – and their customers – achieve “climate neutrality” with their products and operations. The concept of carbon neutrality dictates that organizations and/or individuals make a commitment to the option of compensating for unavoidable emissions by reducing or avoiding emissions elsewhere. <br /><br />Certification of the SōL is just one aspect of Lamina’s Carbon Footprint Reduction Program™, a comprehensive, company-wide environmental initiative. Along with a growing list of partners, Lamina supports a web site, truthinlighting.org that provides a wealth of information about how companies and individuals can work toward achieving carbon neutrality. Interactive forums, blogs, and RSS feeds will establish the site as a source for concrete factual information in regard to lighting and energy consumption. <br /><br />Lamina is also undertaking a plan that includes a carbon footprint reduction of its own with a goal of corporate carbon neutrality, also to be facilitated by 3C Group.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-40822331422458066652007-12-22T15:58:00.000-08:002007-12-22T16:41:42.822-08:00100W LED Grow Light with 3640 Lumens<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTZ6vWM_km0pRbZn6ljyZgKMW4ktgSK8lpCbjrLsrTxsM85xkWi1cowU3Qbbe6ZtzPI_IcNWaIrtwOKu8jzeQwjRUDigh7JeiIKaljxStxgss8vPmzlt-j5D23E5r6smJADQ6b/s1600-h/100W+LED+Grow+Light.jpg"><img id="BLOGGER_PHOTO_ID_5146959247381530498" style="FLOAT: right; MARGIN: 0px 0px 10px 10px; CURSOR: hand" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTZ6vWM_km0pRbZn6ljyZgKMW4ktgSK8lpCbjrLsrTxsM85xkWi1cowU3Qbbe6ZtzPI_IcNWaIrtwOKu8jzeQwjRUDigh7JeiIKaljxStxgss8vPmzlt-j5D23E5r6smJADQ6b/s400/100W+LED+Grow+Light.jpg" border="0" /></a><br /><div>Solid State <em><strong>LED Grow Lights</strong></em> are gaining traction again, this time with a press release from Dialight (Lumidrives) reporting that the Canadian Standards Association (CSA) has certified for sale its new state of the art SafeSite fixture for sale. Dialight reportedly designed its SafeSite fixture to replaces conventional 175W to 250W metal- halide and high-pressure sodium light sources with 100W LED technology for hazardous location applications. CSA Certification involves stringent testing and requires that all wiring be done with CSA-approved materials.</div><br /><div>Additional features and benefits include:</div><div><br />Low power consumption<br />Universal input supply (120 - 277 VAC)<br />Suitable for all Class 1, Div 2, Groups A, B, C, D<br />hazardous environments T4A rated<br />Patent pending optical design<br />State of the art solid state lighting source<br />Self-contained wiring compartment eliminates<br />additional junction boxes<br />Weather/corrosion resistant lamp assembly and housing<br />5 year warranty<br />Resistant to shock and vibration<br />Instant on / off response<br />Wide operating voltage range<br />Power factor > .9<br />THD < 20%<br /></div><br /><div>This is more good news for anyone looking for a stand alone fixture that could be safely used indoors as <em><a href="http://ledgrowlights.blogspot.com/">LED Grow Lights</a></em>. The newly approved Solid State Lighting fixture weighs 19lbs and consumes 85-115W (100W nominal) at 110 volts; for a total output of 3640 Lumens ( 70% lumen maintenance over 50,000 operating hours ). Now if they could start offering other models in different spectrums as <strong>LED Grow Lights</strong> everyone would have a happy holiday season to rejoice over.</div>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-4316955902993218042007-12-08T14:49:00.000-08:002007-12-08T14:57:36.505-08:00Photonic Lattice LEDs are new class of light-emitting deviceA bit older, but LEDsmagazine had reported new <a href="http://ledgrowlights.blogspot.com/">Solid State LED lighting</a> technology:<br /><br />Using photonic lattice technology it is possible to build large-area chips that enable ultra-high power sources for projection and other applications, writes Robert Karlicek of Luminus Devices.<br />The term “power LED” usually describes one of two types of LED assemblies: a conventional 1 mm2 power chip in a power package, or an array of chips (1 mm2 or smaller) combined in one of several different types of power packaging formats (semiconductor chip(s), package, encapsulant and heat sink).<br /><br />While the performance of power LED devices has improved dramatically over the past 10 years, the basic concepts haven’t changed too much over the past forty years: one or more small LED semiconductor chips attached to a metal packaging structure and covered by an encapsulant/lens to help extract and shape the light output.<br /><br />Conventional power LEDs have gradually evolved through incremental improvements in semiconductor and packaging materials and manufacturing processes.<br /><br />Here we describe a new generation of ultra-high-power photonic lattice LEDs, which operate at input powers as high as 100 W and are orders of magnitude brighter than conventional power LEDs. These are the first commercially available LEDs using photonic crystal concepts to manage light extraction from the LED.<br /><br />Now a 100W per package is impressive no doubt, hopefully this finds itself into the <a href="http://ledgrowlights.blogspot.com/">LED Grow Light</a> segment soon.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-34667021150405624682007-12-08T14:12:00.000-08:002007-12-08T14:18:25.590-08:00Taiwan LED Chip maker VPEC gains New patent in the US marketVisual Photonics Epitaxy (VPEC), a Taiwan-based high brightness LED chip maker, recently announced that the company has secured a patent for LEDs with a reflective layer in the USA market, according to a company filing with the Taiwan Stock Exchange (TSE).<br /><br />Market sources also citied in a recent Chinese-language Economic Daily News (EDN) report indicated that the patent is similar to patents 5008718, 5376580 and 5502316 which Lumileds secured in 1989-1995.<br /><br />More great news for the High Brightness LED Solid State Lighting industy.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-39242055950215328692007-12-08T13:21:00.000-08:002007-12-08T13:30:14.915-08:00LED chip maker Genesis Photonics announces new patents for white LEDsDigitimes is reporting that:<br /><br />Taiwan-based LED chip supplier Genesis Photonics yesterday debuted its latest patents on white LED technology which the company claims can produce a white LED chip without the need to combine a blue LED and phosphor.<br /><br />Around two years ago, Genesis started volume production of single white LED chips using this technology with most of the products shipping to Japan, said the company. The production cost for this product is not far off from traditional blue and green LEDs. However, as the brightness of LEDs produced using this technology is still not as bright as ordinary ones, few LED makers are adopting the technology and Genesis is partnering with downstream vendors directly, stated company president Hsu Shi-Hong (transliterated from Chinese).<br /><br />The company also aims for the proportion of revenues from the blue and green LED segments to reach up to 60% and 40%, respectively, in 2008, up from 45% and 55%, respectively at present, the company added. Meanwhile, the company will increase the number of its metal-organic chemical vapor deposition (MOCVD) equipment to over 25 units by the end of 2008, compared to 19 units now, noted the LED chip company.<br /><br />This should be great news for the overall health of the Solid State LED lighting market, more competition in the <a href="http://ledgrowlights.blogspot.com/">LED Grow Light </a>industry is always good.Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-25963988232462936652007-09-27T19:30:00.001-07:002007-09-27T20:17:44.068-07:00iDrive™ 1000 Powers LED Grow LightsAs promised in the LED Grow Lights <a href="http://ledgrowlights.blogspot.com/2007/09/cree-prototypes-1000-lumen-led-chip.html">1000+ Lumen LED</a> post, here is one of many Bench Power Supplies posts for working with the latest generation UHB LEDs. This is one of the best Solid State Lighting PSUs on the market, and should be on every DIY <a href="http://ledgrowlight.blogspot.com/">LED Grow Light</a> bench.<br />( Radiant Research- please send over an engineering sample for test and review purposes, I will pay for shipping and duty! )<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAkVp6OuGvZ0vok1FDkeRNJiPdzdTk0BdImcv21Nwv4vCXq_vFm92eWce36LZyVKzNlQxvdKEsfT8IVzdodeZ6phXXMaEj7rSf38Bg6vvq0oAZ42KraWuHbMBF1Ko8vN7Ktuka/s1600-h/210_idrive_1000_LED_Driver.jpg"><img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAkVp6OuGvZ0vok1FDkeRNJiPdzdTk0BdImcv21Nwv4vCXq_vFm92eWce36LZyVKzNlQxvdKEsfT8IVzdodeZ6phXXMaEj7rSf38Bg6vvq0oAZ42KraWuHbMBF1Ko8vN7Ktuka/s400/210_idrive_1000_LED_Driver.jpg" alt="" id="BLOGGER_PHOTO_ID_5115083823565778914" border="0" /></a><br /> <div align="justify"></div><blockquote><div align="justify">Integrated System Technologies, a leading European LED driver design manufacturer, has released the new 210 Watt 3 channel iDrive™ 1000 LED driver. The driver is a natural extension to the current iDrive™ range which includes the 3 channel 350mA driver, the iDrive™ Lite. Both products incorporate patented Pulse Amplitude Modulation (PAM) drive technology and ColourCool™, a thermal management system to ensure optimum LED output and life.<br /></div><div align="justify"> </div><div align="justify"> </div><br />The new iDrive™ 1000 delivers an industry leading level of energy efficiency provided through new patent pending technology which delivers twice the power density of the iDrive™ Lite. The breakthrough in combining high power density with leading PSU efficiency ensures the iDrive™ 1000 has a small footprint and does not require large heatsinks.<br /><br />A new feature enables iDrive™ 1000 users to choose the forward current, independently on all three channels between 500mA-1000mA. This exclusive feature introduced to the high power LED market place enables users to select the forward current digitally by channel for optimum LED performance. Each channel’s forward current can be precisely varied in 50mA steps via the LED display panel. Unlike most solutions in the market, there are no external DMX address switches making it very quick to install and configure. The 1000 provides an increased forward voltage range up to 55V per channel to allow for the increase in forward voltage in high power LEDs when driving these products at higher currents. Additional features include a master/slave option, increased internal preset programmes and user selectable thermister settings for desired fixture lumen maintenance in any environment.<br /><br />The iDrive™ range uses patented technologies that differentiates it from all LED drivers on the market, in addition the drivers will only supply the correct forward voltage required by each LED channel and compensates for voltage drop over long cable runs thereby optimising the energy required to drive the LED fixture. This makes the iDrive™ solutions the most intelligent and power efficient drivers on the market, providing a significant advantage to all SSL manufacturers that are serious about reducing the carbon footprint of their lighting product range.<br /><br />Sales Director Matt Fitzpatrick said, “Since we launched the iDrive™ Lite in March 07, it has been received fantastically by the market place however, the design team are extremely excited about the potential of the iDrive™ 1000. There is choice globally for drivers in the 350mA 3 channel class but there are no 210 Watt high efficiency drivers that allow the user to vary the current on each channel between 500mA-1000mA. With many of the high power LED manufacturers now delivering product that is optimised at 700mA and 1000mA drive currents, we now feel that the iDrive™ 1000 will give the SSL manufacturers a high quality power supply solution and allow them to efficiently get more lumens for their money”.<br /><br />The iDrive™ 1000 will be available in volume from September 2007 with engineering sample available in August<br />Dimensions 200mm x 150mm x 70mm<br />Weight 0.8Kg approx.<br />Compatible with all high power LEDs<br /><br /><strong style="font-weight: normal;">About Integrated System Technologies Limited</strong><br />IST Ltd is a professional lighting group company specialising in the development of innovative lighting solutions for the general, wide area, architectural and entertainment lighting industry. It offers over 20 years of experience in traditional and solid state lighting including award winning electronic and optical system design for a variety of lighting products from controllers to luminaires.<br /><br />Radiant Research Ltd is the solid state lighting division of IST which designs and manufactures advanced solid state lighting products from <a href="http://ledgrowlights.blogspot.com/">LED light engines</a> through to driver solutions. All LED driver technology designed and produced by Radiant Research incorporates our unique patented technology Colour Cool™ (GRANTED in UK & USA) to ensure optimum LED efficiency of multiple channel systems. This unique and patented driving technology uses Pulse Amplitude Modulation (PAM). This technique provides optimum colour mixing (RGB/A/W) and full additive luminosity which, integrated into our closed loop temperature monitory system, ensures optimum LED output regardless of environmental conditions.</blockquote>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-60242393963243189102007-09-21T15:04:00.000-07:002007-09-21T15:12:47.258-07:00Goldeneye Allowed LED Lighting Color Conversion Patent<span style="font-family:Arial, Helvetica, sans-serif;font-size:-1;"><blockquote>Goldeneye, Inc., creator of light recycling technology and the world’s brightest <a href="http://ledgrowlights.blogspot.com">LED light sources</a>, today announced the allowance by the U.S. Patent Office for its patent of a new color conversion method for LEDs utilizing a solid luminescent element. This “wavelength conversion chip” can be used with Goldeneye’s recycling light cavity or attached directly to any LED. The patent covers both methods of manufacture and a wide range of applications in solid-state lighting. The technology described in the patent enables Goldeneye’s next generation of LED light products to produce white, yellow, green, red and a spectrum of visible colors from blue or ultraviolet LEDs.<br /><br />"This technology will enable significant improvements in efficiency and color rendering as well as greatly simplifying binning requirements”, says Scott Zimmerman, Vice President of Technology for Goldeneye. “It also delivers life and thermal performance that powdered phosphor approaches simply cannot match.”<br /><br />This patent will add to Goldeneye's already strong IP portfolio, enhancing the company’s ability to manufacture and license technology in virtually all solid-state lighting applications. It encompasses ceramic processing techniques such as tape casting and sintering to form thin luminescent sheets for volume production.<br /><br />In Goldeneye’s basic technology, multiple LEDs are combined in a “light-recycling cavity” to enhance their individual brightness output. By incorporating the conversion chip in this arrangement, the individual LEDs can operate at lower drive levels with improved optical efficiency, unlike other high brightness approaches that rely on overdrive conditions. The result is a light source with a longer lifetime, greater wavelength stability and superb color uniformity.<br /><br />“Our early work in the area of very high intensity LED sources forced us several years ago to develop a new type of wavelength conversion technology compatible with these high flux levels”, says Zimmerman. “The conversion chip will enable all of Goldeneye’s <span><span style="font-family:Arial, Helvetica, sans-serif;font-size:-1;">high brightness LED</span></span> light products to operate at greater efficiency than in other conversion schemes”.<br /><br />About Goldeneye<br /><br />Goldeneye, Inc. is a technology foundry and light product manufacturer focused on optical solutions to the solid-state lighting market. The company is headquartered in Carlsbad, California.</blockquote> </span>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-59386813692451342442007-09-20T13:04:00.000-07:002007-09-20T13:26:29.104-07:00LED Grow Lights from Inexpensive Polarized Light<blockquote></blockquote><span class="storydate"></span><br /><img src="http://www.newsroom.ucla.edu/images/spacer.gif" height="10" width="100" /><br /> <span class="headline"></span><blockquote><span style="font-weight: bold;" class="headline">Advances in Creating Inexpensive Polarized Light May Lead to Better <a href="http://ledgrowlights.blogspot.com">LED Grow Lighting</a></span><br /> <span class="copy"><div class="Section1"> <p>UCLA chemists working at the nanoscale have developed a new, inexpensive means of forcing luminescent polymers to give off polarized light and of confining that light to produce polymer-based lasers. </p> <p>The research, which could lead to a brighter polarized light source for LEDs in laptop computers, cell phones and other consumer electronics devices, currently appears in the advance online edition of the journal Nature Nanotechnology.</p> <p>The research was conducted by UCLA professors of chemistry and California NanoSystems Institute members Sarah Tolbert and Benjamin J. Schwartz, and colleagues, including Hirokatsu Miyata, a research scientist with Canon's Nanocomposite Research division in Japan. The research is federally funded by the National Science Foundation and the Office of Naval Research and privately funded by Canon.</p> <p>The researchers have succeeded in taking semiconducting polymers — plastics that consist of long chains of atoms that work as semiconductors — and stretching them out in a silica (glass) host matrix so that they have new optical properties.</p> <p>"If you have polymer chains that can wiggle like spaghetti, it's hard to make them all point in the same direction," Tolbert said. "What we do is take tiny, nanometer-sized holes in a piece of glass and force the polymer chains into the holes. The holes are so small that the spaghetti chains have no space to coil up. They have to lie straight, and all the chains end up pointing in the same direction."</p> <p>Because the chains point in the same direction, they absorb polarized light and give off polarized light. Lining up the polymer chains also provides advantages for laser technology, because all the chains can participate in the lasing process, and they can make the light polarized without the need for any external optical elements, Tolbert said.</p> <p>As a postdoctoral fellow, Schwartz was one of the original discoverers in the 1990s that lasers could be made out of randomly oriented semiconducting polymer chains.</p> <p>"Our new materials exploit the fact that the polymer chains are all lined up to make them into lasers that function very differently from lasers made out of random polymers," Schwartz said.</p> <p>The manner in which the polymer chains incorporate into the porous glass of the silica matrix helps to confine the light in the material, enhancing the lasing process by producing what is known as a "graded-index waveguide." In most lasers, confining the light is typically done with external mirrors.</p> <p>"Our materials don't need mirrors to function as lasers, because the material that's lasing is also serving to confine the light," Schwartz said. </p> <p>In combination, the alignment of the polymer chains and the confinement of the light make it 20 times easier for the new materials to lase than if a randomly oriented polymer sample were used. And because polymers can be dissolved easily in solvents, they are inexpensive to process. The glass host matrix with the aligned nanoscale pores is also inexpensive to produce.</p> <p>"Usually polarized and cheap don't go together," Tolbert said.</p> <p>The research opens the possibility of additional applications for the new materials as a brighter polarized source for displays in products with LED-type displays, including cell phones, laptops and Palm Pilots.</p> <p>"If you take an inexpensive light source with which you could excite the aligned polymer chains and get the chains to reemit, you potentially have a more efficient way to generate polarized light." Tolbert said. "This would allow displays to be brighter with less power consumption, and you could get longer battery life." </p> <p>Tolbert has collaborated with Canon for years on the development of this class of new materials.</p> <p>In addition to Tolbert, Schwartz and Miyata, co-authors include UCLA researcher and former postdoctoral scholar Ignacio Martini, UCLA chemistry graduate student Ian Craig, and UCLA chemistry graduate student William Molenkamp.</p> <p>UCLA is <st1:place st="on"><st1:state st="on">California</st1:state></st1:place>'s largest university, with an enrollment of nearly 37,000 undergraduate and graduate students. The UCLA College of Letters and Science and the university's 11 professional schools feature renowned faculty and offer more than 300 degree programs and majors. UCLA is a national and international leader in the breadth and quality of its academic, research, health care, cultural, continuing education and athletic programs. Four alumni and five faculty have been awarded the Nobel Prize.</p></div></span></blockquote><span class="copy"><div class="Section1"><p><span class="storydate"> </span></p></div></span>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-51949626531312503082007-09-09T18:08:00.000-07:002007-09-27T20:41:30.626-07:00Cree Prototypes 1,000+ Lumen LED chipCree breaks 1000 Lumens on a single die!<br /><br />The next post should be about <a href="http://ledgrowlights.blogspot.com">LED Grow Light</a> <a href="http://ledgrowlights.blogspot.com/2007/09/idrive-1000-powers-led-grow-lights.html">bench power supplies</a> that can handle the additional power requirements of the emerging next generation solid state lighting chips.<br /><br /><p></p><blockquote><p> With a driving current of 4A, the company's prototype, single-die LED delivers a light output of 1,050 lumens in cool white, a level comparable to a standard incandescent bulb, and 760 lumens in a warm-white version. </p><p> As a result, the company claims this breakthrough may lead to the development of LEDs that will make traditional light bulbs obsolete. </p><p> Efficacy of the cool-white LED is 72 lumens/Watt and, for the warm-white device, 52 lumens/Watt. </p><p> Both versions allegedly operate at significantly higher efficacy levels than conventional light bulbs.</p></blockquote><p> </p>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0tag:blogger.com,1999:blog-25826708.post-20246970283839225592007-09-07T04:52:00.000-07:002007-09-08T14:02:44.968-07:00Solid State FUV LEDs reach 210nmThese new Far-Ultraviolet (FUV) leds are great news for the many in the Bio Industries:<br /><br /><blockquote>A joint research group led by Japan's Institute of Physical and Chemical Research (Riken) and Saitama University developed a UV-LED with an emission wavelength as short as 227.5 nm and an output of 0.15 mW. <div id="leaf-content"> <p>Thus far, another research group has reported the development of a UV-LED with an emission wavelength of 210 nm, but its output was only 0.02 μW. In addition to the prototype unveiled this time, the <a href="http://techon.nikkeibp.co.jp/english/NEWS_EN/20070906/138843/">research group of Riken and Saitama University</a> succeeded in prototyping UV-LEDs with a wavelength of 253 nm and an output of 1 mW, 261 nm and 1.65 mW, and 273 nm and 3.3 mW. </p> <p> According to the group, the outputs of these UV-LEDs are substantially equivalent to those of blue, red and white LEDs used in electric lamps. And the outputs are on a level such that these UV-LEDs can be used as-is in germicidal lamps. </p> <p> With a view to applications for sterilization, water purification, medical care and the high-speed degradative treatment of pollutants, etc., the research group intends to further enhance the efficiency and output of its latest UV-LED. </p> <p>The prototype UV-LED uses an AlGaN semiconductor. The UV-LED was obtained by first forming an ALN layer on a sapphire substrate, and then forming an n-type AlGaN layer, AlGaN emitting layer (triple quantum well structure), p-type AlGaN layer, etc. stacked on one another by crystal growth. </p> <p> The research group upgraded the crystal growth method of the AlN layer provided on the sapphire substrate to enhance the output. According to the new method, multiple AlN layers are formed by alternately using two different growth methods. </p> <p> First, an AlN layer is formed by continuously supplying the Al material while intermittently supplying (i.e. supplying in a pulsed manner) ammonium gas. Then, another AlN layer is formed by continuously supplying both the Al material and ammonium gas. </p> <p> This crystal growth method is called the Ammonia pulsed supply multiple layer growth method. The method resulted in (1) a decrease of threading dislocation density in the AlN crystals, (2) an increase in flatness of crystal layers and (3) a reduction of cracks due to the distortion in the crystals. </p> <p> Because the quality and flatness of the AlN layer was improved, other layers formed on the AlN layers also resulted in higher quality and flatness, thereby enhancing the emission intensity (output) from the AlGaN emitting layer. The emission intensity was increased to approximately 50 times that obtained by the existing AlN layer formation method. </p> <p>The latest UV-LED was an achievement by Hideki Hirayama, the head of Terahertz Quantum Device Laboratory, Terahertz-wave Research Program, Frontier Research System of Riken, and Norihiko Kamata, professor of graduate school of science and engineering, Saitama University. </p> </div></blockquote>Led Grow Lightshttp://www.blogger.com/profile/08991196597889065112noreply@blogger.com0