Lux to watts calculator

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

The lux is measure luminous flux per unit area(symbol: lx). It is the SI unit of illuminance and luminous emittance , It is equal to one lumen per square metre.

Lux to watts with area in square meters formula:

P(W) = Ev(lx) × A(m2) / η(lm/W)

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