from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The flow of light per unit of time, especially the flux of visible light expressed in lumens.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun In photometry, the measure of the power of light as perceived by the human eye, in proportion to the power at each wavelength.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the rate of flow of light energy


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