| quotient of the reflected radiance at a point on a surface of a non-self-radiating medium in a given direction and that of the perfect reflecting diffuser identically irradiated and viewed Note 1 to entry: In general, the reflected radiance factor from a surface does not depend upon the relative spectral distribution of the irradiation. This is not the case for a photoluminescent surface, where it is necessary to specify this quantity. Note 2 to entry: The reflected radiance factor has unit one.
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