Patent ID: 7482565

Claim:
An apparatus, comprising: at least one first LED to generate first radiation having a first spectrum; at least one second LED to generate second radiation having a second spectrum different than the first spectrum; at least one controller to control at least one of the first radiation and the second radiation so as to provide visible radiation emanating from the apparatus; and at least one sensor to monitor at least one characteristic of sample radiation and provide at least one sensor signal to the at least one controller, wherein the sample radiation includes at least some of the visible radiation emanating from the apparatus, such that the at least one sensor signal provides at least one feedback signal to the at least one controller, wherein the at least one controller is configured to make a comparison of the at least one feedback signal and at least one reference value and formulate at least one calibration value based on the comparison, and wherein the at least one controller uses the at least one calibration value, once formulated, to control the at least one of the first radiation and the second radiation without using the at least one feedback signal, the apparatus further comprising at least one memory coupled to the at least one controller to store the at least one reference value and the at least one calibration value.