A unit of surface luminance used when defining diffusing surfaces equal to 1 lumen m-2.

The apostlib equal to the brightness produced by 1/pi candela per square meter or 10-4 lambert.

Also known as a blondel, in honour of the French physicist André Blondel (1863-1938) for his pioneering work in photometry.

See also: Illuminance.

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Subjects: Optics Physics