photon flux [*Φ*_{p}]

quotient of the number of photons, d*N*_{p}, emitted, transmitted, or received in an element of time, d*t*, by that element of time

Unit: s^{-1}

NOTE For a beam of radiation whose spectral distribution is _{} or _{}, the photon flux *Φ*_{p} is:

where

*h* is the Planck constant;

*c*_{0} is the speed of light in vacuum.

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