Patent ID: 6998594

Claim:
A method of maintaining light characteristics from a multi-chip light emitting diode (LED) package having a plurality of LED chips, comprising: providing at least one enclosure having a plurality of apertures, each aperture having a respective predetermined size and facing a respective one of said LED chips; providing a light sensor disposed in said at least one enclosure, said at least one enclosure being arranged such that each of said plurality of apertures channels light from the corresponding respective one of said LED chips to said light sensor; restricting light received by said light sensor from said corresponding respective one of said LED chips to produce a restricted light signal, said restricting being proportioned at least in part according to the respective predetermined size of the aperture facing said corresponding respective one of said LED chips; measuring the restricted light signal produced by said light sensor to produce a sensed light signal; comparing the sensed light signal to a desired light signal to produce a result; and adjusting current to at least one LED on the multichip LED package based on the result.