Linked from
The 35 pages that link to Luminance, each with the reason it gives.
Luminous fluxCompared with: It describes directional brightness, not total luminous output.
RadianceCompared with: It applies the radiance framework to perceived brightness in human vision.
ChromaticityCompared with: Chromaticity excludes brightness information that luminance measures.
Luminous intensityCompared with: It adds source area to the directional measure of intensity.