Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m2). A non-SI term for the same unit is the "nit". The CGS unit of luminance is the stilb, which is equal to one candela per square centimetre or 10 kcd/m2.

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CIECAM02 - Chromatic Adaptation - Post-adaptation
... based on the generalized Michaelis–Menten equation (as depicted aside) FL is the luminance level adaptation factor As previously mentioned, if the. 5LA for convenience.) In photopic conditions, the luminance level adaptation factor (FL) is proportional to the cube root of the luminance of the adapting field (LA) ... it is proportional to LA (meaning no luminance level adaptation) ...
Luminance - Units
... A variety of units have been used for luminance, besides the candela per square metre ... One candela per square metre is equal to 10-4 stilbs (the CGS unit of luminance) π apostilbs π×10-4 lamberts 0.292 foot-lamberts ...