Cree, Inc. innovator and maker of great LED lighting products has achieved an amazing industry-best lighting efficiency of 186 lumens per watt for a white power LED.
Cree’s tests confirmed that the LED produced 197 lumens of light output and achieved 186 lumens per watt efficacy at a correlated color temperature of 4577K. The tests were conducted under standard LED test conditions at room temperature.
– from sustainabledesignupdate