flux (1) (luminous)

The time rate of flow of luminous energy.

(2) (radiant): The time rate of flow of radiant energy.

(3) (of particle radiation): Used as a synonym for "flux density" only in JESD57 and JESD89A.

References: 

JESD77-B, 2/00

JESD77-B, 2/00

JESD57, 12/96
JESD89A, 10/06