The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.
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direct flux, <on a surface>
luminous flux received by the surface directly from a lighting installation
Note 1 to entry: The direct flux is expressed in lumen (lm).
Note 2 to entry: This entry was numbered 845-09-44 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-316 in CIE S 017:2011.