Light Bulb Wattage Comparison Calculator
Compare two light bulbs by wattage, brightness and running cost to find the more efficient and cheaper bulb.
Compare Your Options And Get Clear Answers
Compare two light bulbs by wattage, brightness and running cost to find the more efficient and cheaper bulb.
Light Bulb Wattage Comparison Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Efficiency
Lumens divided by watts shows how well a bulb turns power into light.
Running Cost
Watts Γ hours Γ· 1,000 Γ price per kWh.
Replacement
Hours per year Γ· lifespan Γ bulb price.
Use As A Guide
Results are estimates based on your inputs. Check real quotes, rates and professional advice before deciding.
Bulb Wattage Guide
Equivalent bulbs for similar brightness.
| Brightness | Incandescent | Halogen | LED |
|---|---|---|---|
| 450 lm | 40 W | 28 W | 4 β 6 W |
| 800 lm | 60 W | 42 W | 8 β 10 W |
| 1100 lm | 75 W | 53 W | 11 β 13 W |
| 1600 lm | 100 W | 72 W | 16 β 20 W |
| Rule of Thumb | Choose lumens first | LED β 100 lm per watt | Warm white β 2700K |
Light Bulb Wattage Calculator FAQ
Answers to common questions about this calculator.
Only within the same type. A 9 W LED can be as bright as a 60 W incandescent.
The unit of visible light output. More lumens means a brighter bulb.
LEDs reach 80 to 120 lumens per watt, while incandescent bulbs give about 10 to 17.
No. Use your own prices and tariff.