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Brightness
In telecommunication, brightness is an attribute of visual perception in which a source appears to emit a given amount of light.
"Brightness" was formerly used as a synonym for the photometric term luminance and (incorrectly) for the radiometric term radiance[?]. "Brightness" should now be used only for nonquantitative references to physiological sensations and perceptions of light.
Source: from Federal Standard 1037C
With regard to stars etc. see apparent magnitude, absolute magnitude.
See also
For the worldview, see Bright. For mental accuity, see intelligence.
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