Enter the electrical power and efficiency of the light source into the calculator to determine the light output. This calculator can also evaluate any of the variables given the others are known.

Volts To Lumens Formula

The following formula is used to calculate the lumens from volts.

L = V * E


  • L is the light output (lumens)
  • V is the electrical power (volts)
  • E is the efficiency of the light source (lumens per volt)

To calculate the lumens from volts, multiply the electrical power by the efficiency of the light source. The efficiency of the light source is a measure of how many lumens are produced per volt. This value can vary greatly depending on the type of light source, so it is important to use the correct efficiency value for the specific type of bulb or technology being used.

What is Volts To Lumens?

Volts to lumens is a conversion process used to determine the amount of light produced (lumens) from the electrical power (volts) consumed by a light source. This is important in lighting design and energy efficiency calculations, as it allows for comparison of different types of light sources based on their light output and energy consumption. However, the conversion is not straightforward because it depends on the efficiency of the light source, which can vary greatly between different types of bulbs and technologies.

How to Calculate Volts To Lumens?

The following steps outline how to calculate the Volts To Lumens using the formula L = V * E.

  1. First, determine the electrical power (V) in volts.
  2. Next, determine the efficiency of the light source (E) in lumens per volt.
  3. Next, gather the formula from above = L = V * E.
  4. Finally, calculate the light output (L) in lumens.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

electrical power (V) = 12 volts

efficiency of the light source (E) = 5 lumens per volt