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radiant flux

(measure of brightness)

Radiant flux (often symbolized φe) the rate of energy (power) emitted/radiated by something, e.g., joules per second or watts. A star's radiant flux is called its luminosity.

Spectral fluxe,ν or φe,λ) is the radiant power per hertz (frequency) or meter (wavelength).


(EMR,measure)
http://en.wikipedia.org/wiki/Radiant_flux

Referenced by:
flux
luminosity distance (dL)
photon counting
radiometer
spectral index (α)

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