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The formal link between magnitudes per square arcsecond and luminance isdiscussed in this paper. Directly related to the human visual system, luminanceis defined in terms of the spectral radiance of the source, weighted by the CIEV($\lambda$) luminous efficiency function, and scaled by the 683 lm/W luminousefficacy constant. In consequence, any exact and spectrum-independentrelationship between luminance and magnitudes per square arcsecond requiresthat the latter be measured precisely in the CIE V($\lambda$) band. Theluminance value corresponding to m_VC=0 (zero-point of the CIE V($\lambda$)magnitude scale) depends on the reference source chosen for the definition ofthe magnitude system. Using absolute AB magnitudes, the zero-point luminance ofthe CIE V($\lambda$) photometric band is 10.96 x 10^4 cd/m^2.

Variations on a classical theme: On the formal relationship between magnitudes per square arcsecond and luminance