Lumens to watts calculator

Luminous flux in lumens (lm) to electric power in watts (W) calculator.

Enter the luminous flux in lumens, luminous efficacy in lumens per watt and press the Calculate button to get the power in watts:

Enter luminous flux in lumens: lm
Enter light source:
Or enter luminous efficacy in lumens per watt: lm/W
Power result in watts: W

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


Watts to lumens calculator ►

Lumens to watts calculation formula

Energy saving lamps have high luminous efficacy (more lumens per watt).

The power P in watts (W) is equal to the luminous flux ΦV in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W):

P(W) = ΦV(lm) / η(lm/W)

Lumens to watts table

Lumens Incandescent
light bulb
 / LED
375 lm 25 W 6.23 W
600 lm 40 W 10 W
900 lm 60 W 15 W
1125 lm 75 W 18.75 W
1500 lm 100 W 25 W
2250 lm 150 W 37.5 W
3000 lm 200 W 50 W


Lumens to watts calculation ►


See also

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