# 17-29-045

zonal flux, <of a light source, for a zone>

difference of the cumulative fluxes for the solid angles subtended by the upper and lower boundaries of the zone

Note 1 to entry: The zonal flux is expressed in lumen (lm).

Note 2 to entry: This entry was numbered 845-09-32 in IEC 60050-845:1987.

Note 3 to entry: This entry was numbered 17-1448 in CIE S 017:2011.

Publication date: 2020-12