Lux to lumens calculator

Lux to lumens calculator

We are offering online calculator to help you make calculations with Illuminance in lux (lx) to luminous flux in lumens (lm) to help you calculate.

You simply need to enter the illuminance in lux (lx), then select area unit type, and enter the radius in meters for spherical light source or the surface area which is measured in square meters for any light source and hit the = button to obtain the luminous flux in lumens (lm).

 Enter Illuminance in lux: lx Select area unit type: Area in square feet Area in square meters Enter spherical radius: Or enter surface area: Luminous flux result in lumens: lm

Lux to lumens calculation formula

Calculation with area in square feet

The value of luminous flux ΦV in lumens (lm) is apparently equal to 0.09290304 times the value of illuminance Ev in lux (lx) multiplied by the surface area A measured in square feet (ft2).

ΦV(lm) = 0.09290304 × Ev(lx) × A(ft2)

The luminous flux ΦV measured in lumens (lm) is apparently equal to 0.09290304 times the illuminance Ev measured in lux (lx) multiplied by the 4 times the value of pi multiplied by the squared sphere with radius r in feet (ft).

ΦV(lm) = 0.09290304 × Ev(lx) × 4⋅π⋅r(ft) 2

Calculation with area in square meters

The luminous flux ΦV  measured in lumens (lm) is apparently equal to the illuminance Ev measured in lux (lx), multiplied by the surface area A measured in square meters (m2).

ΦV(lm) = Ev(lx) × A(m2)

The luminous flux  ΦV is apparently measured in lumens (lm) is equal to the value of illuminance Ev measured in lux (lx) times 4 times the value of pi multiplied by the squared sphere with radius r in meters (m).

ΦV(lm) = Ev(lx) × 4⋅π⋅r 2(m2)