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Lumens to Watts Converter
Lumens measure light output while watts measure energy use, and the ratio between them is called efficacy. Incandescent bulbs manage around 14 lumens per watt, halogens about 18, CFLs 60 and LEDs 100 or more.
How it works
Light output
Bulb technology
Hours used per day
Electricity rate
Equivalent wattage
Energy per year
Running cost per year
Frequently asked questions
How do I use the Lumens to Watts Converter?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.