Lumens To Watts Calculator

Enter luminous flux in lumens: lm
Enter light source:
Or enter luminous efficacy in lumens per watt: lm/W
Power result in watts: W
  • Lumen:

Lumen is the SI unit of luminous flux. It is a measure of the total amount of visible light from a lamp or light source.

  • Watt:

 Watt is the unit of power. Power of 1 Watt is the product of current of 1 Ampere and voltage of 1 Volt.

  • How to Use Lumens To Watts Calculator?
  1. Enter the luminous flux in Lumens.
  2. Select the source of light. E.g: Halogen Lamp, LED Lamp.
  3. Click on the calculate button, you will get power in Watts.
  • Lumens To Watts Calculation:

P(W) = ΦV(lm) / η(lm/W)


P(W)  =Power in Watts

ΦV(lm) =Luminous flux in Lumens

η(lm/W)= Luminous Efficacy in Lumens per Watt.