The XLamp XM is a single-chip LED that delivers 160 lumens per watt at 350 mA, said to be a record. The LED also delivers 750 lumens at 2 A, which is equivalent to the light output of a 60-W incandescent light bulb at less than 7 W.
Developed by LED maker Cree, a cool white XM LED driven at 350 mA can produce 160 lumens at 160 lumens per watt. The new platform has a larger footprint than Cree's XP family and also offers high efficacy at high drive currents. At 2 A, an XM LED produces 750 lumens at 110 lumens per watt. The thermal resistance of the XM platform is 2 degrees C per watt-- an industry-leading technology breakthrough and a 3.5X improvement over Cree's flagship XLamp XP-E LED.
Samples of the XLamp XM LEDs are available for order with standard lead times and commercial availability is targeted for Fall 2010.
More info:http://www.cree.com/press/press_detail.asp?i=1271079100891