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Apostilb (asb) is a unit in the category of Luminous luminance. It is also known as apostilbs. This unit is commonly used in the German unit system. Apostilb (asb) has a dimension of L^-2J where L is length, and J is luminous intensity. It can be converted to the corresponding standard SI unit cd/m² by multiplying its value by a factor of 0.3183099.

Note that the seven base dimensions are M (Mass), L (Length), T (Time), Q (Temperature), N (Aamount of Substance), I (Electric Current), and J (Luminous Intensity).

Other units in the category of Luminous luminance include Candela Per Square Meter (cd/m²), Candle Per Square Centimeter (candle/cm²), Candle Per Square Foot (candle/ft²), Candle Per Square Inch (candle/in²), Candle Per Square Meter (candle/m²), Foot-Lambert (ft-L), Lambert (L), Nit (nit), and Stilb (sb).