Lumens to lux calculator

Lumens to lux calculator

How to calculate?

Luminous flux in lumens (lm) to illuminance in lux (lx)
Enter the luminous flux in lumens, 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 illuminance in lux:

Enter luminous flux in lumens: lm
Select area unit type:  
Enter spherical radius:
Or enter surface area:
   
Illuminance result in lux: lx


Lumens to candela calculator

Calculations of Lumens to lux

There are two methods to calculate the lumens to lux:

Calculation with area in square feet

The illuminance Ev in lux (lx) is equal to 10.76391 times the luminous flux ΦV in lumens (lm) divided by the surface area A in square feet (ft2):

Ev(lx) = 10.76391 × ΦV(lm) / A(ft2)

 

The illuminance Ev in lux (lx) is equal to 10.76391 times the luminous flux ΦV in lumens (lm) divided by 4 times pi times the squared sphere radius r in feet (ft):

Ev(lx) = 10.76391 × ΦV(lm) / (4⋅π⋅r(ft)2)

Calculation with area in square meters

The illuminance Ev in lux (lx) is equal to the luminous flux ΦV in lumens (lm) divided by the surface area A in square meters (m2):

Ev(lx) = ΦV(lm) / A(m2)

 

The illuminance Ev in lux (lx) is equal to the luminous flux ΦV in lumens (lm) divided by 4 times pi times the squared sphere radius r in meters (m):

Ev(lx) = ΦV(lm) / (4⋅π⋅2(m2))

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