17-712

luminance coefficient (at a surface element of a medium, in a given direction, under specified conditions of illumination) [qv; q]

quotient of the luminance of the surface element in the given direction by the illuminance on the medium

        

where

    L is the luminance in cd·m-2;
    E is the illuminance in lx

Unit: sr-1

NOTE See NOTE to “radiance coefficient”.

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