Enter the total light load (watts) and the total light area (ft^2) into the Lighting Power Density (LPD) Calculator. The calculator will evaluate the Lighting Power Density (LPD). 

Lighting Power Density (LPD) Formula

The following two example problems outline the steps and information needed to calculate the Lighting Power Density (LPD).

LPD = LL / LA

Variables:

  • LPD is the Lighting Power Density (LPD) (watts/sq-ft)
  • LL is the total light load (watts)
  • LA is the total light area (ft^2) 

How to Calculate Lighting Power Density (LPD)?

The following steps outline how to calculate the Lighting Power Density (LPD).


  1. First, determine the total light load (watts). 
  2. Next, determine the total light area (ft^2). 
  3. Next, gather the formula from above = LPD = LL / LA.
  4. Finally, calculate the Lighting Power Density (LPD).
  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.

total light load (watts) = 500

total light area (ft^2) = 300

LPD = LL / LA = ?