Or you can go back to basics and build this reflective RGB sensor from an LED and a photocell. The principle behind [TechMartian]’s approach is simplicity itself: shine different colored lights ...

Axis Communications AXIS T90B25 is an outdoor white LED illuminator with interchangable ... AXIS T90B25 is turned on and off either by the built-in photocell or through the camera I/O port or a PIR ...