Lumens to Watts conversion

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

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


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 conversion table

Lumens Incandescent light bulb (watts) Fluorescent / LED (watts)
375 lm25 W6.23 W
600 lm40 W10 W
900 lm60 W15 W
1125 lm75 W18.75 W
1500 lm100 W25 W
2250 lm150 W37.5 W
3000 lm200 W50 W

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