Watts to lumens (lm) conversion calculator

Enter the power in watts, luminous efficacy in lumens per watt and press the Calculate button to get the luminous flux in lumens:


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

Luminous flux result in lumens:		lm

* the predefined luminous efficacy values are typical / average values.

* the predefined luminous efficacy values are typical / average values.

Watts to lumens calculation

Energy saving lamps have high luminous efficacy (more lumens per watt).

The luminous flux Φ_V in lumens (lm) is equal to the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W):

Φ_V(lm) = P_(W) × η_(lm/W)