Lux to watts calculator

Lux to watts conversion calculator

Illuminance in lux (lx) to electric power in watts (W) calculator

How to calculate the power in watts?

Enter the illuminance in lux, luminous efficacy in lumens per watt, surface area in square feet / meters or spherical radius in feet / meters and press the Calculate button to get the power in watts:

Enter illuminance in lux:  
lx
Select light source:
Or enter luminous efficacy in lumens per watt:
lm/W
Enter surface area:  
Or enter spherical radius:  
   
 
   
Power  result in watts:  
W


Lux to lumens calculator

*the predefined luminous values are typical or average values.

Conversion formula:

Lux to watts calculation with area in square feet

The power P in watts (W) is equal to the 0.09290304 times the illuminance Ev in lux (lx) times the surface area A in square feet (ft2), divided by the luminous efficacy η in lumens per watt (lm/W):

P(W) = 0.09290304 × Ev(lx) × A(ft2) / η(lm/W)

Lux to watts calculation with area in square meters

The power P in watts (W) is equal to the illuminance Ev in lux (lx) times the surface area A in square meters (m2), divided by the luminous efficacy η in lumens per watt (lm/W):

P(W) = Ev(lx) × A(m2) / η(lm/W)

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