Light from a plurality of light sources is combined in a beam combiner. Photo-sensors are used to sense the intensity of each light source. Signals from the photo-sensors may be used to control the intensity of the light sources. The photo-sensors can be located in the beam combiner or located in the fringe of a collimated beam produced by the beam combiner. The illumination system has application in laser-scanning micro-projectors, for example.

 
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