Patent ID: 9247605
Filing Date: 2016-01-26
CPC Classification: H05B

Claim Text:
1. A method for controlling a lamp comprising multiple emission light emitting diode (LED) elements, the method comprising: operating one or more of the multiple emission LED elements to produce illumination substantially continuously by supplying a respective drive current at an operative drive current level to each of the one or more of the multiple emission LED elements; bringing the respective drive current of each of the emission LED elements within the lamp to a non-operative drive current level, which is insufficient to produce illumination, for the duration of each of multiple detection intervals interspersed with periods of said illumination; monitoring a detection photocurrent induced in a detection interval photodetector within the lamp during at least a portion of each of the multiple detection intervals; bringing the respective drive current of all except a first one of the emission LED elements within the lamp to a non-operative drive current level which is insufficient to produce illumination, for the duration of a first measurement interval occurring subsequent to the multiple detection intervals and after a period of said illumination, wherein during said first measurement interval, the method comprises: