Illuminance in lux (lx) to luminous flux in lumens (lm) calculator and how to calculate.
Enter the illuminance in lux (lx), select area unit type, enter radius in meters for spherical light source or surface area
in square meters for any light source and press the Calculate button to get the luminous flux in lumens (lm):
The luminous flux ΦV in lumens (lm) is equal to 0.09290304 times the illuminance Ev in lux (lx) times the surface area A in square feet (ft2):
ΦV(lm) = 0.09290304 × Ev(lx) × A(ft2)
The luminous flux ΦV in lumens (lm) is equal to 0.09290304 times the illuminance Ev in lux (lx) times 4 times pi times the squared sphere radius r in feet (ft):
ΦV(lm) = 0.09290304 × Ev(lx) × 4⋅π⋅r(ft) 2
The luminous flux ΦV in lumens (lm) is equal to the illuminance Ev in lux (lx) times the surface area A in square meters (m2):
ΦV(lm) = Ev(lx) × A(m2)
The luminous flux ΦV in lumens (lm) is equal to the illuminance Ev in lux (lx) times 4 times pi times the squared sphere radius r in meters (m):
ΦV(lm) = Ev(lx) × 4⋅π⋅r 2(m2)
