Enter the luminous flux (lumens) and the power (watts) into the Calculator. The calculator will evaluate the Light Efficiency.

## Light Efficiency Formula

LE = LF / P

Variables:

- LE is the Light Efficiency (lumens/watt)
- LF is the luminous flux (lumens)
- P is the power (watts)

To calculate Light Efficiency, divide the luminous flux by the power.

## How to Calculate Light Efficiency?

The following steps outline how to calculate the Light Efficiency.

- First, determine the luminous flux (lumens).
- Next, determine the power (watts).
- Next, gather the formula from above = LE = LF / P.
- Finally, calculate the Light Efficiency.
- 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.

luminous flux (lumens) = 34

power (watts) = 10