电气 power in watts (W) to luminous flux in lumens (lm) 计算器 and how to 计算.
输入 the power in watts, luminous efficacy in lumens per watt and press the 计算 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)
