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radiant flux

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radiant flux [′rād·ē·ənt ′fləks]
(optics)
The time rate of flow of radiant energy.
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The latter is usually not observable, but must be taken into account because its presence affects the radiant flux transmitted in the forward direction.
Issues in optical diffraction theory by Mielenz, Klaus D. / Journal of Research of the National Institute of Standards and Technology
Unlike radiant flux, which measures the total amount of light energy put out by a light source, luminous flux measures the amount of light that can be perceived by the human eye.
Lumens and LEDs That Use Them Explained by Ben Anton / Home based business community
The net radiant flux between layers is obtained by taking the difference between radiosities at the bounding surfaces.
Calculating center-glass performance indices of glazing systems with ... by Wright, John L. / ASHRAE Transactions
 
 
 
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