It’s reported that Cree Inc. has achieved industry-best reported R&D results of 161 lumens per watt for a white power LED. Cree's tests confirmed that the 1mm x 1mm LED produced 173 lumens of light output and achieved 161 lumens per watt efficacy at a color temperature of 4689K. The tests were conducted under standard LED test conditions at a drive current of 350mA, at room temperature.