Luminous flux

Quantity derived from radiant flux ϕe by evaluating the radiation according to its action upon the CIE standard photometric observer. For photopic vision


where dϕe(h)/dλ is the spectral distribution of the radiant flux and V(λ) the spectral luminious efficiency.

Unit: lm

Reference:
CIE 084-1989: Measurement of Luminous flux