How To Calculate

Learn how to calculate anything
Menu
  • bmi
Home
Energy
How to Convert Watts to Lumen.
Energy

How to Convert Watts to Lumen.

Rosemary Njeri

Lumen is the SI derived unit measuring how much light you are getting from a bulb.

While watt is a unit of power measuring the amount of energy an item needs to function.

Formula to convert W to lm.

Converting these units is like measuring how well a light source converts energy into light.

For a 100 W incandescent bulb produces about 1,600 lumens, for an efficiency of 1,600/100 = 16 lumens per watt.

A halogen bulb consumes only 72 watts for the same amount of brightness, making its efficiency to be 22 lumens per watt.

A CFL bulb consumes 26 W making its efficiency to be 61 lumens per watt.

LED bulbs, which are the most efficient, consume only 22 watts for an efficiency of 73 lumens per watt.

Example:

Convert 75 watts incandescent bulb if its efficiency is 15 watts per lumen and you asked to convert the energy to lumens per watt.

= 75 x 15

=1125 Lumens.

= 800 lumens.

Share
Tweet
Reddit
Pinterest
Email
Prev Article
Next Article

Related Articles

How to Calculate Watt Hours.
Watt is the SI unit of power, equivalent to one …

How to Calculate Watt Hours.

How to Calculate Amps Hours.
The ampere, often shortened to “amp”, is the base unit …

How to Calculate Amps Hours.

Popular Posts

    Categories

    learntocalculate.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.

    How To Calculate

    Learn how to calculate anything

    Pages

    • About Us
    • Contact Us
    • Privacy Policy
    Copyright © 2025 How To Calculate

    Ad Blocker Detected

    Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker.

    Refresh