## Lumens to lux calculator

We are offering Luminous flux in lumens (lm) to illuminance in lux (lx) calculator to make your calculations easy, check now! All you need to do is to enter the luminous flux in lumens and select the area unit type, enter radius in meters for the spherical light source or the total surface area which is measured in square meters for any light source and hit the = button to obtain the illuminance in lux.

## Formula for Lumens to lux calculation

### Calculation with the area in square feet

The illuminance *E*_{v} which is measured in lux (lx) is apparently equal to 10.76391 times the value of luminous flux *Φ*_{V} in lumens (lm) and finally divided by the surface area *A* measured in square feet (ft^{2}).

**E _{v(lx)} = 10.76391 × Φ_{V(lm)} / A_{(ft}2_{)}**

The illuminance *E*_{v} measured in lux (lx) is apparently equal to 10.76391 times the value of luminous flux *Φ*_{V} in lumens (lm) which is divided by 4 times the value of pi, further multiplied by the squared sphere radius r in feet (ft).

**E _{v(lx)} = 10.76391 × Φ_{V(lm)} / (4⋅π⋅r_{(ft)}^{2})**

### Calculation with area in square meters

The illuminance *E*_{v} in lux (lx) is apparently equal to the value of luminous flux *Φ*_{V} in lumens (lm) which is further divided by the surface area *A* measured in square meters (m^{2}).

**E _{v(lx)} = Φ_{V(lm)} / A_{(m}2_{)}**

The illuminance *E*_{v} in lux (lx) is apparently equal to the luminous flux *Φ*_{V} which is measured in lumens (lm) and divided by 4 times the value of pi multiplied by the squared sphere radius r measured in meters (m).

*E*_{v(lx)} = *Φ*_{V(lm)}* */* *(4⋅π⋅*r *^{2}_{(m}2_{)})