Watts to lux calculator with formulas

Enter power in watts:
	W
Select light source
-- select light source -- Tungsten incandescent light bulb Halogen lamp Fluorescent lamp LED lamp Metal halide lamp High pressure sodium vapor lamp Low pressure sodium vapor lamp Mercury vapor lamp
Or enter luminous efficacy in lumens per watt:
	lm/W
Enter surface area:
	ft² m²
Or enter spherical radius:
	ft m
Illuminance result in lux:
	lx

* the predefined luminous efficacy values are typical / average values.

Watts to lux calculation :-

Watts to lux calculation with area in square feet

The illuminance E_v in lux (lx) is equal to 10.76391 times the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W) divided by the surface area A in square feet (ft²):

E_v(lx) = 10.76391 × P_(W) × η_(lm/W) / A_(ft2₎

Watts to lux calculation with area in square meters

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

E_v(lx) = P_(W) × η_(lm/W) / A_(m2₎