## Wikipedia - Flusso luminoso (it) Wikipedia - فيض ضوئي (ar) luminous flux

https://doi.org/10.1351/goldbook.L03646
Of a source of @[email protected] $$I$$ in an element of solid @[email protected] $$\text{d}\varOmega$$ is given by $$\text{d}\varPhi = I\ \text{d}\varOmega$$.
Sources:
Green Book, 2nd ed., p. 72 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 979 [Terms] [Paper]