coefficient of retroreflected luminance (of a plane retroreflecting surface) [RL]

quotient of the luminance, L, of the retroreflective surface in the direction of observation by the illuminance, , at the retroreflector on a plane perpendicular to the direction of the incident light


Unit: cd⋅m-2⋅lx-1

NOTE This quantity is particularly suitable for describing materials in sheet form.

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