LED Bulb (800lm, 80 lm/W)
Lumens: 800 lm; Lumens per Watt (Efficiency): 80 lm/W
Watts: 10 W
Lumens to Watts Calculator
Physics0.0(0)
Calculates the approximate wattage of a light source based on its lumen output and efficiency (lumens per watt). This helps estimate energy consumption.
More tools:Science & Lab Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Lumens and Lumens per Watt (Efficiency) in the units shown.
Step 2
Read Watts in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
LED Bulb (1600lm, 100 lm/W)
Lumens: 1,600 lm; Lumens per Watt (Efficiency): 100 lm/W
Watts: 16 W
CFL Bulb (1000lm, 60 lm/W)
Lumens: 1,000 lm; Lumens per Watt (Efficiency): 60 lm/W
Watts: 16.66666667 W
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