DOE Releases GATEWAY Report on Museum LED Retrofit Lighting
The U.S. Department of Energy (DOE) has published the final evaluation report from a retrofit of track lighting used to illuminate a special photography exhibition at the J. Paul Getty Museum in Malibu, California. During the demonstration, 12W LED PAR 38 lamps replaced 60W halogen PAR 38 30° flood lamps on a one-for-one basis across three adjacent gallery spaces.
Read more »
Diamond Brightens the Performance of Electronic Devices and LEDs
Two new studies performed at the U.S. Department of Energy’s Argonne National Laboratory have revealed a new pathway for materials scientists to use previously unexplored properties of nanocrystalline-diamond thin films. While the properties of diamond thin films are relatively well-understood, the new discovery could dramatically improve the performance of certain types of integrated circuits by reducing their "thermal budget."
Read more »
Research and Markets Releases "Smart Lighting 2012" Report
The Research and Markets report provides an analysis of the worldwide smart lighting market and builds on NanoMarkets’ extensive six-year experience of analyzing the solid-state lighting industry. The report shows how new value is being created in the lighting market by adding enhanced electronics and intelligent luminaires and how such product strategies will be able to build on the massive trend towards introducing CFLs, LEDs, OLEDs and other forms of energy efficient lighting. Read more »
Flexible Organic LED (OLED) Lighting Reaches High Energy Efficiency
Chemical group Solvay and Holst Centre have demonstrated high efficiency flexible Organic Light Emitting Diodes (OLED) lighting tiles with a surface area of 69cm². These large-area demonstrators contain several layers deposited by solution processing at Holst Centre and additional layers applied by conventional vacuum deposition at Solvay.
Read more »
At High Environmental Temperatures and at Very Low Power LED's Wall Plug Efficiency Exceeds 100%
For the first time, researchers have demonstrated that an LED can emit more optical power than the electrical power it consumes. Although scientifically intriguing, the results won’t immediately result in ultra-efficient commercial LEDs since the demonstration works only for LEDs with very low input power that produce very small amounts of light and emits primarily in the invisible IR range of 2.4 µm.
Read more »
Power Integrations - 15.3 W Dimmable LED Driver Design for PAR30/PAR38 Applications
The engineering team at PI just released an isolated, high power factor, TRIAC dimmable, LED driver design for PAR30/PAR38 applications. Design Example Report 314 (DER-314) is designed to drive a nominal LED string voltage of 36 V at 425 mA from an input voltage range of 185 VAC to 265 VAC.
Read more »
Success in Research: First Gallium-Nitride LED Chips on Silicon in Pilot Stage
Researchers at Osram Opto Semiconductors have succeeded in manufacturing highperformance prototypes of blue and white LEDs, in which the light-emitting gallium-nitride layers are grown on silicon wafers with a diameter of 150 millimeters. The silicon replaces the sapphire commonly used until now without a loss in quality. Already in the pilot stage, the new LED chips are to be tested under practical conditions, meaning that the first LEDs on silicon from Osram Opto Semiconductors could hit the ...
Read more »
DOE Releases Consortium Report on LED Street Lights
The U.S. Department of Energy (DOE) has published the final report from a demonstration of LED technology in ornamental post-top street lights, conducted in Sacramento, CA. This report provides an overview of the evaluation of four different LED replacement products using computer simulations, field measurements, and laboratory testing. The evaluation was conducted by DOE’s Municipal Solid-State Street Lighting Consortium in collaboration with the Sacramento Municipal Utility District and the ... Read more »
Independent Study Demonstrating that Pink Sapphire Produces Highest Transmission Colorless Epi-Wafers
GT Advanced Technologies Inc. announced the release of a case study that details the findings of a series of blind material studies conducted to evaluate the impact of sapphire color on the LED manufacturing process. The studies demonstrated that all sapphire, regardless of source, exhibits color at the core level, that the pink hue of GT Advanced Sapphire Furnace (ASF™) material is not indicative of impurities, and that pink ASF sapphire does not have an adverse affect on the LED manufacturing ...
Read more »
New LED Driver Design from Power Integrations Maximizes Efficiency of Compact B10, GU10, E17 and A19 Bulbs
Power Integrations, maker of the world's most efficient, longest-lasting off-line LED driver ICs, today published a reference design (DER-297) describing a high-efficiency, ultra-compact driver for a B10-style LED light bulb. Based on Power Integrations' LinkSwitch-PL non-isolated, single-stage LED driver IC, the power supply is specifically tailored for use with high-voltage LEDs such as the recently announced XLamp XM-L and XLamp XT-E ranges from Cree. DER-297 provides the high-voltage output ...
Read more »
Cree Study Shows LED Lighting is Best Bet for Energy Efficiency
A new report on the life-cycle energy usage of energy-efficient lighting by Cree, Inc. shows that LED lighting products are now more efficient than traditional lighting products when compared across the high-volume applications of recessed downlighting and display spotlighting. Evaluating light fixtures and applications, the white paper’s energy comparisons demonstrate that LEDs offer clear advantages in terms of energy costs and environmental impact over traditional lighting such as ...
Read more »
Solid State Lighting for Incandescent Replacement—Best Practices for Dimming
This paper focuses on integrated LED lamps intended for replacement of general service incandescent lamps. Future white papers are planned to address other LED dimming topics, such as: color change; light output and efficiency (dimming curve); dimming protocols (Internet protocols, 0-10); LED modules with auxiliary drivers; and control architectures that dim without modulated power. Read more »
