Lumens to Watts

Lumens to Watts Tool


Lumens to Watts: Understanding Their Relationship and How to Convert


The measurement of light and energy has always been an integral part of various sectors like electronics, photography, and even general home lighting. Lumens and watts are two such units that are frequently used to measure light and energy respectively. Learning to convert lumens to watts can be useful for multiple reasons including understanding the efficiency of light bulbs or calculating the energy use of electronic equipment.

Quick Summary:

  • Lumens and watts are units to measure light and energy respectively.
  • Understanding and converting between lumens and watts is beneficial in various sectors.
  • The history, relationship, and reasons to convert between lumens and watts will be further explored in this article.

History of Measuring Lumens

The measurement of light in units called Lumens started in the early 20th century. Scientists needed more accurate quantification of light output from sources like candles and lamps, leading to the development of the lumen as a standard unit of light flow.

History of Measuring Watts

The concept of watts, named after the Scottish engineer James Watt, was introduced in the 1880s. It was used as a measure of power in the International System of Units. The watt is defined as one joule of energy per second and is used to express the rate of energy transfer.

The link between Lumens and Watts

Lumens and watts are related in that they measure two different aspects of a light source. While Lumens measure the total amount of visible light from a source, watts measure the rate of energy use by that source. Thus, a light source with a higher lumen count and a lower wattage is more energy efficient.

Understanding the conversion between lumens and watts is essential in day-to-day life as it can help individuals save energy and ensure optimal lighting for their indoor environments.

Common reasons to convert Lumens to Watts

People might find the need to convert lumens to watts for various reasons:

  • To understand the energy efficiency of light bulbs and choose the most energy-saving option.
  • To calculate the power consumption of lighting in homes, offices, or other buildings.
  • To design lighting systems for photography or cinematography that require specific light outputs.

: Do you know?

Here are some facts about measuring Lumens and Watts:

  • Lumens were officially introduced as a unit of light flow in 1948.
  • The term watt is named in honour of James Watt for his contributions to the development of the steam engine.
  • A standard 60W incandescent bulb produces around 800 Lumens, while an energy-saving LED light bulb uses only 13-15 Watts to produce the same light output.
  • The world’s most luminous LED light bulb produces 160,000 Lumens and consumes 100 watts of energy.

These facts underline the importance and practical benefits of understanding and converting between lumens and watts.

Zippy Calc Key Benefits

  • FAST

    Optimized for SPEED. We pride ourselves on having FAST calculators available for you. We know you’ve got other important things to do and that’s why we’ve reduced all excess button clicks so you can be in, out, and on your way.


    No charge to you. We get paid and keep the lights on via our advertisers on the site (which we try to make as least intrusive as possible)


    Here’s a tidbit. We include stats and interesting facts alongside of each of our calculators. These may be helpful to you along your way and provide you an insight and link to a resource to help you on your way.


    Chose not to be boring. We’ve found that a lot of our competitors (yes, there are online calculator competitors, can you believe the world we live in) have very BORING websites. We’re not trying to be boring. We want you to have a chuckle.