Of a source of luminous intensity I in an element of solid angle dΩ is given by dΦ = I dΩ.
Sources:
Green Book, 2nd ed., p. 72 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)
PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 979 (https://doi.org/10.1351/pac199668040957)