電気 power in watts (W) to luminous flux in lumens (lm) 計算機 and how to 計算.
Enter the power in watts, luminous efficacy in lumens per watt and press the 計算 button to get the luminous flux in lumens:
* the predefined luminous efficacy values are typical / average values.
Energy saving lamps have high luminous efficacy (more lumens per watt).
The luminous flux ΦV in lumens (lm) is equal to the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W):
ΦV(lm) = P(W) × η(lm/W)
