Difference between revisions of "Luminance"
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Luminance
</dt>
In photometry, a measure of the intrinsic luminous
intensity emitted by a source in a given direction; the illuminance produced by light from
the source upon a unit surface area oriented normal to the line
of sight at any distance from the source, divided by the solid
angle subtended by the source at the receiving surface. Also
called brightness but luminance is preferred. See
Lambert law. Compare luminous
emittance.
</dd>
It is assumed that the medium between source and receiver
is perfectly transparent; therefore, luminance is independent
of extinction between source
and receiver. The source may or may not be self-luminous. Luminance
is a measure only of light; the comparable term for electromagnetic
radiation in general is radiance.
</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
