| quotient of the reflected luminance 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: The reflected luminance factor for a spectrally non-neutral surface depends upon the relative spectral distribution of the illumination. This quantity has to be specified. Note 2 to entry: The reflected luminance factor has unit one.
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