US Patent 8188685 Light-generating system

A light-generating system including a LED load array having a number of light-emitting diodes, and a heat sink on which the LED load array is mounted. The system also includes a power control unit electrically connected to the power source and the LED load array, for converting input electrical power to output electrical power and controlling voltage and current of the output electrical power provided to the LED load array, and a temperature detector subassembly adapted for sensing a heat sink temperature of the heat sink. The temperature detector subassembly monitors the heat sink temperature and transmits a control signal to the power control unit upon determining that the heat sink temperature differs from a preselected temperature by more than a preselected minimum difference. Upon receipt of the control signal, the power control unit changes the voltage of the output electrical power accordingly.