A lighting fixture for producing a beam of light having a prescribed luminous flux spectrum. In one example, the lighting fixture comprises a plurality of groups of light-emitting devices, each such group configured to emit light having a distinct luminous flux spectrum, and a controller configurable...http://www.google.de/patents/US20060012987?utm_source=gb-gplus-sharePatent US20060012987 - Methods and apparatus for generating and modulating illumination conditions
