Watts to lumens calculator

Electric power in watts (W) to luminous flux in lumens (lm) calculator and how to calculate.

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.


Lumens to watts calculator ►

Watts to lumens calculation

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)


Watts to lumens calculation ►


See also

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