| radiance in a given direction that results from emission at the surface of a photoluminescent medium under specified conditions of irradiation compared to the radiance in the same direction by the perfect reflecting diffuser identically irradiated Note 1 to entry: The luminescent radiance factor depends upon the spectral power distribution of the irradiation and this quantity is typically specified for a given CIE illuminant condition. Note 2 to entry: The luminescent radiance factor has unit one.
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