The 208 lm/W LED produced 208 lumens of light output 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.
As acknowledged in Cree's press release, this level of performance is not yet available in Cree’s production LEDs. The company says that this R&D result passes a "significant milestone" within the solid-state lighting industry, as well as demonstrating Cree’s "relentless drive" to increase the performance of its LEDs.
“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 is a result of improvements in blue [chip] 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.”