Lux to Lumens

Lumens are the units of luminous flux. Imagine the flux from a luminaire to be the sum of the lengths of all the rays of light.

Lumens with area in square feet

The luminous flux ΦV in lumens is equal to 0.09290304 times the illuminance in lux (lx) multiples the surface area A in square feet (ft2) respectively.

ΦV = 0.09290304 × Ev(lx) × A(ft2)