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High hot/cold factor boosts HB-LED efficacy

Philips’ new Luxeon Rebel HB LEDs (high-brightness light-emitting diodes) have a 0.93 hot/cold factor—the ratio of junction temperatures at 100 and 258°C. The new devices thus exceed typical specs for production LEDs, whose hot/cold factors range from 0.8 to 0.85. These factors are important in applications such as light-fixture luminaires, which spend most of their time operating at temperatures of 80 to 1108°C—much higher than the 258°C junction temperature that most HB-LED spec sheets give as the light output. As its junction temperature increases, an LED’s light output and efficacy decrease.

Philips Lumileds, www.philipslumileds.com.