Watts to lux calculator

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

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 Formula:

Ev(lx) = P(W) × η(lm/W) / A(m2)

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