Watts To Lumens Calculator

Enter power in watts: W
Enter light source:
Or enter luminous efficacy in lumens per watt: lm/W
Luminous flux result in lumens: lm


Definition:The SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.


Definition:Watts is a combination of Amps and volts. Watts is a measurement of the amount of energy being released. The higher the wattage is, the more power and output from the appliance.

How to Use Watts to Lumens?

  1. Enter the powerin watts.
  2. Select the source of light. Eg: Halogen Lamp, LED Lamp.
  3. Click on calculate button, you will get Luminous flux result in lumens.

Watts to Lumens Calculation:

The high luminous efficacy (more lumens per watt) is used by Energy saving lamps.

The luminous flux ΦV in lumens (lm) is equal to the power P in watts (W), n times the luminous efficacy in lumens per watt (lm/W):