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Cree Passes LED Per Watt Milestone
Feb 2010
DURHAM, N.C., Feb. 12, 2010 – LED lighting company, Cree, announced a reported efficacy record of 208 lumens per watt for a white power LED. This R&D result passes a significant milestone within the solid-state lighting industry.

Cree reported that the result is due to improvements in blue optical output power, lower operating voltage and higher conversion efficiency. We continue to push the envelope in white LED technology to enable the highest efficiency white lighting products in the marketplace. According to Cree, tests confirmed that the LED produced 208 lumens of light output and achieved 208 lumens per watt efficacy at a correlated color temperature of 4579 K. The tests were conducted under standard LED test conditions at a drive current of 350 mA at room temperature.

“We have now broken the elusive 200-lumen-per-watt efficacy barrier for a single white power LED,” said John Edmond, Cree co-founder and director of advanced optoelectronics.

This level of performance, however, is not yet available in Cree’s production LEDs. Cree’s current product families include recessed LED down lights, blue and green LED chips, high-brightness LEDs, lighting-class power LEDs, power-switching devices and radio-frequency/wireless devices.

Cree solutions are found in applications such as general illumination, electronic signs and signals, variable-speed motors, and wireless communications.

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conversion efficiency
In a pumped laser system, the ratio of output energy to pump energy.
correlated color temperature
Temperature of the blackbody having chromaticity nearest to that of the test source on a specified chromaticity diagram.
208 lumens208 lumens per watt350 mAAdvanced optoelectronicsCommunicationsConsumerconversion efficiencycorrelated color temperatureCreeDownlightsEfficiency RecordJohn Edmondlight sourcesNorth Carolinaoperating voltageradio frequencysolid-state lightingVariable-speed motorsWireless communicationsLEDs

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