The Lumens to Watts Calculator estimates the wattage needed to reach a target light output across incandescent, halogen, CFL and LED technologies, using typical luminous efficacy for each. A custom efficacy can be supplied for a specific product.
Lumens to Watts Calculator
Convert a target lumen output into the wattage each lighting technology needs, or work the other way from watts to lumens, with running cost and a custom efficacy option.
Direction
Technology
Running cost (optional)
Results
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light output
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power required
Notes
About Lumens to Watts Calculator
Features
- Target lumens converted to watts
- Four technologies compared side by side
- Typical efficacy values built in
- Custom efficacy override
- Like-for-like replacement figures
How to Use
- Enter the target lumen output.
- Optionally enter a custom efficacy for a known product.
- Read the required wattage for each technology.
Examples
Example: 800 lm -> about 53.3 W incandescent, 32.0 W halogen, 13.3 W CFL or 8.0 W LED.
Benefits
- Replaces guesswork about "60 W equivalent" claims with efficacy maths
- Shows the scale of the saving between technologies
Frequently Asked Questions
What does this calculator do?
Convert a target lumen output into the wattage each lighting technology needs, or work the other way from watts to lumens, with running cost and a custom efficacy option.
Is my data stored?
No. Everything runs in your browser; nothing is uploaded, saved or logged.