An instrument measuring a radiometric quantity as a function of wavelength under a stated collection geometry and calibration. Measurement at the relevant viewpoint helps connect scene or display output to observer input.
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A spectroradiometer is an analytical instrument used to measure the intensity of light at different wavelengths across the electromagnetic spectrum. It combines the functions of a spectrometer and a radiometer, allowing for the characterization of both the spectral and radiant properties of light sources.