Patent ID: 8071997

Claim:
An LED assembly comprising: a high power LED chip having a first surface and a second surface, the first surface being mounted to a substrate; the second surface being in intimate thermal contact with a light transmissive heat sink having an in-line transmittance of 3 percent or more of theoretical in-line transmittance, a total transmittance of 80 percent or more of the theoretical total transmittance of the material and a thermal conductivity greater than 30 watts per meter-Kelvin during operation, the LED chip arranged to pass light to the light transmissive heat sink and the light transmissive heat sink passing light to a field to be illuminated, and the LED chip being in electrical contact with at least a first electrical connection and a second electrical connection for powering the LED chip; and wherein the intimate thermal contact is such as to be devoid of an additional element between the LED chip second surface and the light transmissive heat sink.