Lighting power density (LPD) calculator

Installed lighting power density is calculated as P_installed / A. Use the stated system boundary and matching input units.

Units

\mathrm{LPD} = \frac{P_{\text{installed}}}{A}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

\mathrm{LPD} = \frac{9600}{12{,}000} = 0.8

Symbol	Meaning	Unit
$\mathrm{LPD}$	installed lighting power density	W/ft²
$P_{\text{installed}}$	complete-system installed lighting input	W
$A$	applicable lit area	ft²

Symbol	Meaning	Unit
$\mathrm{LPD}$	installed lighting power density	W/m²
$P_{\text{installed}}$	complete-system installed lighting input	W
$A$	applicable lit area	m²

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.