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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.