luminous flux

noun Optics.

the rate of transmission of luminous energy: expressed in lumens.

Nearby words

  1. luminous efficacy,
  2. luminous efficiency,
  3. luminous emittance,
  4. luminous energy,
  5. luminous exitance,
  6. luminous flux density,
  7. luminous intensity,
  8. luminous paint,
  9. luminous range,
  10. luminously

Origin of luminous flux

First recorded in 1925–30 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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 lumensSymbol: Φ v
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

Science definitions for luminous flux

luminous flux

[ lōōmə-nəs ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.