luminosity

(redirected from luminosities)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to luminosities: Luminosity function

luminosity

the amount of light emitted or reflected - brightness.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

brightness 

Attribute of visual sensation according to which an area appears to emit more or less light. Syn. luminosity. Note 1: In British recommended practice, the term brightness is now reserved to describe brightness of colour (i.e. the opposite of dullness) as used in the dyeing industry. Note 2: This attribute is the psychosensorial correlate, or nearly so, of the photometric quantity luminance (CIE).
Brightness Acuity Tester (BAT) See glare tester.
brightness constancy See brightness constancy.
brightness enhancement See Brücke-Bartley effect.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
The combination of the XLF and absorption functions enables us to construct a so-called "population synthesis model" of the XRB, (53,71,75-77) where the contributions to the XRB spectrum from AGNs with different luminosities, redshifts, and absorptions are quantitatively described.
In studying the absolute magnitude of various stars, Hertzsprung could calculate their relative luminosities. In 1905 he noticed that there were two kinds of red stars: red stars with very high luminosity (which we now call red giants) and red stars with very low luminosity (which we now call red dwarfs).
Like light bulbs of different wattages, the bursts come in a wide range of luminosities, Kulkarni notes.
Because Type Ia supernovae generally have similar luminosities, astronomers have used them as "standard candles" to measure the universe's expansion history.