Enter the power in watts, luminous efficacy in lumens per watt and press the Calculate 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)