FAST and reliable same day shipping on all orders placed before 4pm EST

Lumens to Watts Conversion

Understanding the Conversion of Lumens to Watts

In the world of lighting, it is essential to have a clear understanding of the units of measurement used to describe the output of a light source. Two of the most commonly used units are lumens and watts. While both units provide information about the amount of light emitted, they measure different aspects of light output. In this article, we will delve into the conversion of lumens to watts and provide a comprehensive guide to help you better understand this topic.

Lumens: A Measurement of Light Output


Lumens are the standard unit of measurement for the total amount of light emitted by a light source. It is the total amount of light that is visible to the human eye and is the most important factor to consider when choosing a light source for a specific task or environment. The higher the number of lumens, the brighter the light will be.

Watts: A Measurement of Energy Consumption

Watts, on the other hand, measure the amount of energy a light source consumes. It is a measure of the rate at which energy is being used, rather than a measure of the amount of light produced. The higher the number of watts, the more energy a light source will consume.

Conversion of Lumens to Watts

The conversion of lumens to watts requires knowledge of the efficiency of the light source. Efficiency is defined as the ratio of light output to energy consumption and is typically measured in lumens per watt (lm/W). The efficiency of a light source can vary greatly, depending on the technology used and the design of the light source.

To convert lumens to watts, the following formula can be used:

Watts = Lumens / Efficiency in Lumens per Watt

Factors Affecting the Conversion of Lumens to Watts

There are several factors that can affect the conversion of lumens to watts, including the type of light source, the design of the light source, and the operating conditions.

Type of Light Source

Different types of light sources have different levels of efficiency. For example, LED lights are typically much more efficient than traditional incandescent lights, with efficiencies ranging from 60-100 lm/W, while incandescent bulbs average 14 lm/W

Design of the Light Source

The design of the light source can also have a significant impact on its efficiency. Factors such as the size of the light source, the type of lens used, and the position of the light source can all affect the efficiency of a light source.


Lumens to Watts Conversion Chart


LED efficacy will vary from manufacturer to manufacturer. The chart below is a great starting point when looking for your next LED bulb.



Shop Total Light Lamps and Bulbs

Shop Total Light bulbs and lamps

Leave a comment

Please note, comments must be approved before they are published