Luminosity

In general physics, luminosity (more properly called luminance) is the density of luminous intensity in a given direction.

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SI light units

Physics: Physics (from the Greek, φυσικός (phusikos), "natural", and φύσις (phusis), "nature") is the science of the natural world in the broadest sense, dealing with matter and energy and the fundamental forces of nature that govern the interaction...

Luminance: The word luminance, a synonym for luminosity, means emitting or reflecting light....

Density: : For other senses of "density", see density (disambiguation)....