Koshel, R. John Photon Engineering, LLC, Tucson, Arizona.
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Luminous flux, the photometric flux or power of visible radiation in the electromagnetic spectrum, is the response of the human visual system to radiant power. The sensitivity of the human eye to visible light is a function of wavelength, with a standard that has been established by the International Commission on Illumination (abbreviated CIE, due to its French form: Commission Internationale de l'Éclairage). The visible spectrum is based on the photopic curve and has been updated since its establishment by the CIE in 1924. The visible spectrum is defined to extend over a range of wavelengths from 380 to 780 nm. The term light typically is used for this region, but it is often extended into the infrared and ultraviolet regions. See also: Light; Photometry
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