Apostilb
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.
See also: Illuminance.
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.
See also: Illuminance.