mean value of 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: Cylindrical irradiance is sometimes also defined as arithmetic mean of the vertical irradiance
Note 2 to entry: The corresponding photometric quantity is "cylindrical illuminance". The corresponding quantity for photons is "photon cylindrical irradiance".
Note 3 to entry: The cylindrical irradiance is expressed in watt per square metre (W·m−2).
Note 4 to entry: This entry was numbered 845-01-41 in IEC 60050-845:1987.
Note 5 to entry: This entry was numbered 17-274 in CIE S 017:2011.