A unit of luminance defined by the German Illuminating Engineering Society (DLTG),
= 
stilb.
It is
the brightness of a perfectly diffusing surface reflecting or emitting one lumen per
square meter. One apostilb = 
nit, or approximately 0.3183 nit. Symbol,
asb.
Also called a blondel.
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Last revised: 12 September 2002.