Lumens to watts 計算機

Luminous flux in lumens (lm) to 電気 power in watts (W) 計算機.

Enter the luminous flux in lumens, luminous efficacy in lumens per watt and press the 計算 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 Φ_V in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W):

P_(W) = Φ_V(lm) / η_(lm/W)

Lumens	Incandescent light bulb (watts)	Fluorescent / LED (watts)
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

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

Power 結果 in watts:		W