Group replacement cost calculator

Normalizes group relamping cost by the fraction of rated life used.

C_{\text{group}} = \frac{L + G}{I}

Calculator

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

Given

C_{\text{group}} = \frac{8 + 3}{0.7} \approx 15.714

Symbol	Meaning	Unit
$C_{\text{group}}$	rated-life equivalent group cost	$/lamp
$L$	net lamp price	$/lamp
$G$	group labor per lamp	$/lamp
$I$	replacement interval as fraction of rated life	—

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