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luminance coefficient in diffuse illumination
quotient of the luminance of a field and the illuminance on the plane of that field, for a diffused lighting and an observation direction forming a grazing angle with the road surface
Note 1 to entry: The luminance coefficient in diffuse illumination is expressed in candela per square metre per lux (cd⋅m−2⋅lx−1).
Note 2 to entry: This entry was numbered 17-713 in CIE S 017:2011.