Patent ID: 7939793

Claim:
A lighting system for humanly visible light illumination, comprising: a light fixture, comprising: (a) a plurality of light emitting diodes (LEDs) for generating visible light; (b) a chamber having a reflective interior surface, at least a portion of the interior surface having a diffuse reflectivity such that the chamber combines light by diffuse reflection within the chamber; and (c) an optical aperture through which combined light is emitted from the chamber in a direction for lighting an area intended to be illuminated by the system; the LEDs being coupled to supply the generated visible light to locations in the chamber and directed so that the visible light supplied from the LEDs is reflected one or more times off the reflective interior surface of the chamber before emission in the combined light through the optical aperture; and (d) a detector for detecting electromagnetic energy of a wavelength at least substantially absent from a spectrum of the combined light from within the area intended to be illuminated by the emission of the combined light through the optical aperture; and a controller coupled to the LEDs for turning the LEDs on and off to turn the lighting system on and off, and when the LEDs are turned on, for controlling an amount of visible light generated from each of the LEDs for inclusions in the combined light, wherein the controller is receives the detection signal from the detector.