Convert lumens to watts for LED, CFL, and incandescent bulbs, and find the right brightness for any room.
Lumen to Watts Calculator
Electrical
Inputs
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Enter the brightness you want in lumens.
Select the bulb type you plan to use.
Click Calculate to see the watts required (and the old incandescent equivalent).
Lumens measure brightness; watts measure power use. LEDs produce far more lumens per watt (~100) than incandescents (~14). An 800-lumen LED uses about 8W, a CFL about 13W, and an incandescent about 57W — all the same brightness.
Living room: ~10–20 lumens per sq ft. Kitchen: ~30–40. Bedroom: ~10–20. Multiply room area (sq ft) by the lumens/sq ft to size the total.