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Radiant flux
Measure of radiant energy over time / From Wikipedia, the free encyclopedia
Not to be confused with Radiation flux.
"Spectral power" redirects here. Not to be confused with Spectral power density.
In radiometry, radiant flux or radiant power is the radiant energy emitted, reflected, transmitted, or received per unit time, and spectral flux or spectral power is the radiant flux per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength. The SI unit of radiant flux is the watt (W), one joule per second (J/s), while that of spectral flux in frequency is the watt per hertz (W/Hz) and that of spectral flux in wavelength is the watt per metre (W/m)—commonly the watt per nanometre (W/nm).
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![A flow chart describing the relationship of various physical quantities, including radiant flux and exitance.](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Flow_chart_inspired_by_Lillesand%2C_Kiefer%2C_Chipman.._Remote_Sensing_and_Image_Interpretation%2C_7th_Edition_Appendix_A.._Radiometric_Concepts%2C_Terminology%2C_and_Units.png/640px-thumbnail.png)