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upward flux, <of a light source>
cumulative flux for the solid angle 2π sr, above the horizontal plane passing through the light source
Note 1 to entry: The upward flux is expressed in lumen (lm).
Note 2 to entry: This entry was numbered 845-09-35 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1378 in CIE S 017:2011.