Everyday life
Lumens to Watts Calculator
Find the wattage for a target brightness.
Did this calculator solve your problem today?
✓ Thank you for your feedback!
Report issue to loopingon.com
Sponsored
Convert light output (lumens) to power (watts) using luminous efficacy.
The math behind it
watts = lumens ÷ efficacy. LEDs ≈ 80–100 lm/W; incandescent ≈ 15 lm/W.
Worked Example
800 lm at 80 lm/W → 10 W (LED).Frequently Asked Questions
Why LEDs save?
Higher efficacy means the same brightness for far fewer watts.
Advertisement