Lumens to watts calculator
Enter the luminous flux in lumens, luminous efficacy in lumens per watt and press the Calculate button to get the power in watts:
* the predefined luminous efficacy values are typical / average values.
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
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