Patent ID: 7737643

Claim:
An apparatus comprising: at least one first white LED configured to generate first radiation having a first spectrum that includes perceivably white light; and a first feed-forward driver coupled to the at least one first white LED and configured to controllably vary a first intensity of the first radiation without monitoring or regulating a first voltage or a first current provided to the at least one first white LED, wherein the first feed-forward driver comprises an energy transfer arrangement including: at least one energy transfer element to store input energy derived from a power source and to provide output energy to the at least one first white LED; at least one switch coupled to the at least one energy transfer element to control at least the input energy stored to the at least one energy transfer element; and at least one diode, wherein the energy transfer arrangement is configured as one of a buck converter, a boost converter, a buck-boost converter, a CUK converter, a flyback converter and a forward converter.