# 17-21-059

photon fluence rate

Ep,o

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 Ω is solid angle and Lp is photon radiance.

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.

Publication date: 2020-12