Lux Per Watt Calculator


In the world of lighting design and energy efficiency, calculating the luminous efficacy, commonly measured in lux per watt, is crucial. This article presents a convenient online calculator for determining this metric.

How to Use

To use the Lux per Watt Calculator, simply input the luminous flux (in lumens) and the power consumption (in watts) of the light source. Click on the “Calculate” button to get the result instantly.


The formula used for calculating luminous efficacy (lux per watt) is:

Example Solve

Let’s say we have a light source with a luminous flux of 1500 lumens and consumes 30 watts of power.

Using the formula:


Q: What is lux per watt?

A: Lux per watt (lm/W) is a measure of luminous efficacy, indicating how efficiently a light source produces visible light per unit of electrical power consumed.

Q: Why is calculating lux per watt important?

A: Calculating lux per watt helps in assessing the energy efficiency of lighting systems, aiding in making informed decisions for energy-saving and sustainable lighting solutions.

Q: Can the lux per watt value vary for different light sources?

A: Yes, different light sources have varying efficiencies, resulting in different lux per watt values. For instance, LED lights typically have higher lux per watt values compared to traditional incandescent bulbs.


The Lux per Watt Calculator provides a simple yet powerful tool for evaluating the efficiency of lighting systems. By understanding and optimizing this metric, individuals and industries can contribute to energy conservation efforts while ensuring adequate illumination.

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