luminance

[loo-muh-nuhns]
noun
1.
the state or quality of being luminous.
2.
Also called luminosity. the quality or condition of radiating or reflecting light: the blinding luminance of the sun.
3.
Optics. the quantitative measure of brightness of a light source or an illuminated surface, equal to luminous flux per unit solid angle emitted per unit projected area of the source or surface.

Origin:
1875–80; < Latin lūmin- (stem of lūmen) light + -ance

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Collins
World English Dictionary
luminance (ˈluːmɪnəns)
 
n
1.  a state or quality of radiating or reflecting light
2.  L a measure (in candelas per square metre) of the brightness of a point on a surface that is radiating or reflecting light. It is the luminous intensity in a given direction of a small element of surface area divided by the orthogonal projection of this area onto a plane at right angles to the direction
 
[C19: from Latin lūmen light]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

luminance
1880, from L. luminantem, prp. of luminare (see luminary).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
luminance   (l'mə-nəns)  Pronunciation Key 
The luminous intensity of a light source per unit area. Occasionally the lambert unit is used to measure luminance. Also called photometric brightness.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

luminance definition


brightness

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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