photon cylindrical irradiance
mean value of photon irradiance on the outer curved surface of a very small (real or imaginary) cylinder that is oriented vertically at a point in space
Note 1 to entry: Photon cylindrical irradiance is sometimes also defined as arithmetic mean of the vertical photon irradiance,
Note 3 to entry: The photon cylindrical irradiance is expressed in second to the power minus one per square metre (s−1·m−2).
Note 4 to entry: This entry was numbered 17-921 in CIE S 017:2011.