Controlled color light source

A controlled color high intensity light source comprising:

• (a) a lamp installed in an enclosure;
• (b) a power supply for energizing the lamp;
• (c) light sampling means for sampling the light emitted by the lamp, said light sampling means including a fiber optic conduit having one end thereof installed in said enclosure adjacent to said lamp and another end disposed external of said enclosure;
• and
• (d) means located external of said enclosure and responsive to said sampling means for measuring the color temperature of the sampled light and for adjusting the power supply to maintain a constant light color emitted by said lamp, said sampling means comprising a pair of photodetectors disposed to receive light transmitted by said conduit and exiting said another end thereof, a divider circuit having a pair of inputs and an output, the inputs of the divider circuit being coupled to the photodetectors and output means being connected to the output of the divider circuit for generating an output whose amplitude is proportional to the color of light sampled by said light sampling means.

A color light detector comprising:

• (a) light sampling means for sampling the light to be detected by the detector;
• (b) a pair of photodetectors arranged to receive the light from the light sampling means, each photodetector comprising a photodiode and a transimpedance amplifier;
• (c) a divider circuit having a pair of inputs and an output, the inputs of the divider circuit being connected to the two photodetectors;
• and
• (d) output means connected to the output of the divider circuit providing an output indication which is indicative of the color of light sampled by said light sampling means.