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This paper discusses spectroradiometric instruments and applications. Multiple-detector spectroradiometers and single-detector scanning spectroradiometers are described , with particular emphasis on current state -of-the -art integrated systems. Applications discussed include: color measurement (colorimetry); photometry and colorimetry of cathode-ray-tubes , light-emitting-diodes and other displays; photometry and colorimetry of light sources and flash lamps ; and colorimetry of reflective and transmissive materials. Future trends are also discussed.