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luminous flux

noun, Optics.
the rate of transmission of luminous energy: expressed in lumens.
Origin of luminous flux
1925-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for luminous flux
  • Luminous intensity and luminous flux follow similar derivations.
  • Therefore, when concerned with regulating illuminance uniformity, it is more relevant to address intensity than luminous flux.
  • Luminaire luminous flux can be directed upwards and/or downwards reaching working surface directly or indirectly.
  • Illuminance means the density of the luminous flux incident on a surface.
  • The ratio of luminous flux to power input of a lamp.
British Dictionary definitions for luminous flux

luminous flux

a measure of the rate of flow of luminous energy, evaluated according to its ability to produce a visual sensation. For a monochromatic light it is the radiant flux multiplied by the spectral luminous efficiency of the light. It is measured in lumens Φv
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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luminous flux in Science
luminous flux
A measure of the radiant power of light emitted from a source without regard for the direction in which it is emitted. It is measured in lumens. See also luminous intensity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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