Patent ID: 8506612

Claim:
A system for emitting light, the light providing a desired light-induced physiological stimulus and a desired luminous stimulus, the system comprising: a plurality of first light-emitting elements configured to emit light of a first wavelength range, said plurality of first light-emitting elements responsive to a plurality of first control signals; said plurality of first light emitting elements including first set of blue LEDs and a second set of blue LEDs, said first set of blue LEDs having a first peak wavelength, said second set of blue LEDs having a second peak wavelength, said first peak wavelength at about 440 nm and said second peak wavelength at about 480 nm; one or more second light-emitting elements configured to emit light of a second wavelength range, the one or more second light-emitting element responsive to one or more second control signals; and a control system operatively coupled to said plurality of first light-emitting elements and the one or more second light-emitting elements, said control system configured to generate said plurality of first control signals and the one or more second control signals based on the desired light-induced physiological stimulus, the desired luminous stimulus, the first wavelength range and the second wavelength range to maintain a substantially constant luminous stimulus by modifying said plurality of first control signals to increase the intensity of said first set of blue LEDs while correspondingly modifying said second control signals to reduce the intensity of said second set of blue LEDs and said one or more second light emitting elements; wherein said control system further is configured to maintain said system emitted tight at said desired luminous stimulus while independently modifying said first set of blue LEDs, said second set of blue LEDs and said one or more second light-emitting elements.