Watts to Lumens Calculator – Quick & Easy Brightness Conversion
Use this tool to quickly find out how bright a light will be based on its wattage. Just enter the number of watts, select your bulb type (LED, CFL, fluorescent, halogen, or incandescent), and click Calculate.
The calculator will instantly show you the estimated lumens, so you can compare brightness levels and choose the right lighting for your needs.
Watts to Lumens Calculator
Note: Real-world output varies by brand, model, color temperature, and driver efficiency. This tool uses typical lm/W values.
How to Convert Watts to Lumens
To convert watts to lumens, you need the watts to lumens formula:
Lumens = Watts × Luminous Efficacy (lm/W)
The luminous efficacy depends on the bulb type. For example, LED bulbs often produce 80–120 lumens per watt, while incandescent bulbs produce only 10–15 lumens per watt.
Watts to Lumens Formula
The general watts to lumens formula is:
Lumens = Watts × Lumens per Watt
Where:
- Watts = power consumed by the bulb.
- Lumens per Watt (lm/W) = efficiency rating of the bulb.
Example: A 10-watt LED (100 lm/W) produces about 1,000 lumens.
How Many Lumens Are in 1 Watt?
The number of lumens per watt varies:
- LED: ~80–120 lumens per watt
- CFL: ~55–70 lumens per watt
- Incandescent: ~10–15 lumens per watt
So, 1 watt can produce anywhere from 10 to 120 lumens depending on the light source.
Watts to Lumens Conversion Chart
| Watts | LED (100 lm/W) | CFL (60 lm/W) | Incandescent (15 lm/W) |
|---|---|---|---|
| 5 watts to lumens | 500 lm | 300 lm | 75 lm |
| 10 watts to lumens | 1,000 lm | 600 lm | 150 lm |
| 15 watts to lumens | 1,500 lm | 900 lm | 225 lm |
| 25 watts to lumens | 2,500 lm | 1,500 lm | 375 lm |
| 40 watts to lumens | 4,000 lm | 2,400 lm | 600 lm |
| 50 watts to lumens | 5,000 lm | 3,000 lm | 750 lm |
| 60 watts to lumens | 6,000 lm | 3,600 lm | 900 lm |
| 75 watts to lumens | 7,500 lm | 4,500 lm | 1,125 lm |
| 100 watts to lumens | 10,000 lm | 6,000 lm | 1,500 lm |
| 150 watts to lumens | 15,000 lm | 9,000 lm | 2,250 lm |
| 300 watts to lumens | 30,000 lm | 18,000 lm | 4,500 lm |
| 1000 watts to lumens | 100,000 lm | 60,000 lm | 15,000 lm |
Also see:
Lumens to Millicandela Calculator
