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photon spherical irradiance
photon fluence rate
mean value of photon irradiance on the outer curved surface of a very small (real or imaginary) sphere at a point in space
Note 1 to entry: The photon spherical irradiance can be expressed by 
where
Note 2 to entry: The photon spherical irradiance is expressed in second to the power minus one per square metre (s−1·m−2).
Note 3 to entry: This entry was numbered 17-934 and 17-926 in CIE S 017:2011.