April/May 2011 issue of LEDs Magazine

April 27, 2011
The April/May 2011 issue of LEDs Magazine is now available.

Visit our magazine page to access all issues of LEDs Magazine (requires FREE subscription to download the PDF file).

+++ Cover +++

LED light sources at specific wavelengths offer optimal performance in horticulture – see page 51. Photo: Osram Opto Semiconductors.

+++ Features +++

SIL CHINASIL China focuses on market expansion China is undergoing dramatic growth both in the manufacture of LEDs and LED-based products, and as a huge consumer of solid-state lighting. The first SIL China event will cover market expansion with an East Meets West theme, says Maury Wright.
STRATEGIES IN LIGHTProgress continues but challenges remain In the second part of our review from Strategies in Light 2011, Tim Whitaker discusses the views of lighting designers, LED market adoption factors, the LightSavers program, light guide technology, and more.
STRATEGIES IN LIGHT Reporting from the Lighting track The LEDs in Lighting track at the 2011 Strategies in Light conference afforded the opportunity to hear about color science, energy efficiency, dimming, digital control, retrofit lighting and other SSL topics, says MAURY WRIGHT.

High-voltage LEDs for indoor retrofit lamps
High-voltage (HV) LEDs have a turn-on voltage that is closer to the mains supply than conventional high-current LEDs. This eliminates components, notably the driver, and offers other advantages, as Epistar’s ALEXANDER WANG explains.

HORTICULTURE Precise LED wavelengths spur plant growth Light sources such as LEDs with emitted energy centered around specific wavelengths may offer optimal performance in horticulture, outperforming broad spectrum sources such as HPS lamps that are widely used in greenhouses today, explains MAURY WRIGHT.

Russia launches LED industry association
The LED lighting industry in Russia is becoming more mature as the country seeks to develop a vertically-integrated manufacturing infrastructure. LEDs Magazine spoke with EUGENE DOLIN, the CEO of a newly-formed LED industry association in Russia.

Navigating the Energy Star maze
UL’s Matthew Sallee answers pressing questions on energy efficiency and Energy Star certification that lighting manufacturers must understand to bring products to market successfully.

LIGHTING DESIGNNRC-IRC imagines the future of SSL in offices LED technologies require thorough investigation before they can be fully implemented in office environments, as ERHAN DIKEL and JENNIFER VEITCH explain.

LED safety standard UL 8750 requires clarity
There is still some clarity needed in how UL 8750 addresses safety requirements for packaged LED components, which can even affect the choice of encapsulation materials, writes JIANZHONG JIAO.

Manufacturing software is key as volumes grow
As LED demand grows rapidly, automation software and process control can get more from current manufacturing lines, and this can be as important as getting new lines up and running quickly, as PHIL WALKER explains.

CASE STUDIES SSL applications in warehouses and carparks Groom Energy has installed LED-based lighting networks in three cold-storage warehouses, with four more planned. Lumetech Group and Lighting Science Group have also retrofitted five downtown-Dallas parking garages with LED-based lighting, explains MAURY WRIGHT.

Part 5: Who shares the responsibility for testing?
Part 5 of PHILIP KEEBLER’s series on compatibility explains that LED lighting manufacturers share responsibility for implementing robust products that can withstand disturbances and work in a compatible manner with the nuances of the power grid.

DESIGN FORUMDesigning reliable LED power supplies The use of quality components, proper component derating and tightly-controlled manufacturing processes all contribute to the design of LED power supplies for long life and high reliability, explains DAVID COOPER.
LAST WORDAn epic year for the LED industry? 2011 could be a watershed year in the maturation of the LED industry, and intellectual property and new private companies will play a key role, says DENNIS COSTELLO, Managing Partner of Braemar Energy Ventures .p>

+++ Columns/departments +++

LEDs promote health in plants and humans


  • Siemens plans Osram IPO, appoints new CEO
  • Texas Instruments to acquire National Semiconductor
  • Bridgelux reports R&D results for GaN-on-silicon
  • Osram and Cree sign LED patent-license agreement
  • LEDs play an increasingly vital role in life-science applications…and more
  • DOE municipal consortium posts draft street-lighting specification


  • Lighting Design Awards