Lumens to Watts Calculator: Convert Brightness to LED, CFL and Bulb Watts
Free tool · Updated October 3, 2026 · By CouponTalk
Your result
Enter your measurements to see your result.
Quick answer
Lumens measure brightness; watts measure power. LEDs give about 90–110 lumens per watt, CFLs about 60, halogen about 20 and old incandescent bulbs about 15. So 800 lumens, the brightness of a 60 W bulb, needs about 9 W in LED. To replace an old bulb, multiply its watts by 15 for lumens, then divide by 100 for the LED watts.
How to use this calculator
- Choose lumens to watts or watts to lumens.
- Enter the value from the pack.
- Pick the bulb type.
Lumens per watt by bulb type
| Bulb type | Lumens per watt | Watts for 800 lumens |
|---|---|---|
| LED | 90–110 | about 8–9 W |
| CFL | about 60 | about 13–14 W |
| Halogen | about 20 | about 40 W |
| Incandescent | about 15 | about 60 W |
Efficiency varies by brand.
Frequently asked questions
How many lumens do I need in a room?
Use the room lighting calculator: about 150 lux for living rooms and 300–400 for kitchens and study areas.
Is a higher-watt LED always brighter?
Usually, but efficiency varies. Compare lumens, not watts.
What colour temperature should I choose?
Warm white (2,700–3,000 K) for bedrooms, cool daylight (5,000–6,500 K) for kitchens and study.
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