Enter the total lumens and the length of the light source into the calculator to determine the lumens per foot. This calculator helps in assessing the brightness of lighting fixtures over a certain length.
Lumens Per Foot Formula
The following formula is used to calculate the lumens per foot.
LPF = TL / L
Variables:
- LPF is the lumens per foot (lm/ft)
- TL is the total lumens (lm)
- L is the length of the light source (feet)
To calculate the lumens per foot, divide the total lumens by the length of the light source in feet.
What is Lumens Per Foot?
Lumens per foot is a measure of the light output per unit length of a light source. It is commonly used to compare the brightness of different lighting fixtures or to determine the appropriate lighting level for a space. This measurement is particularly useful for linear lighting installations such as LED strips or fluorescent tubes.
How to Calculate Lumens Per Foot?
The following steps outline how to calculate the Lumens Per Foot.
- First, determine the total lumens (TL) of the light source.
- Next, determine the length (L) of the light source in feet.
- Next, gather the formula from above = LPF = TL / L.
- Finally, calculate the Lumens Per Foot (LPF).
- 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.
Total lumens (TL) = 1200 lm
Length of the light source (L) = 10 feet
