ClueLuma

Annual lamp replacement cost calculator

Longer life may be offset by a higher lamp price; replacement savings can be negative.

Creplace=N×clamp×hLlifeC_{\text{replace}} = \frac{N \times c_{\text{lamp}} \times h}{L_{\text{life}}}

Calculator

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

count
$/lamp
h/yr
h
$/yr

Worked example

Given

  • NN = 240 count
  • clampc_{\text{lamp}} = 8.5 $/lamp
  • hh = 3,600 h/yr
  • LlifeL_{\text{life}} = 22,000 h
Creplace=240×8.5×360022,000≈333.8C_{\text{replace}} = \frac{240 \times 8.5 \times 3600}{22{,}000} \approx 333.8

Symbols and units

SymbolMeaningUnit
CreplaceC_{\text{replace}}annualized lamp purchase cost$/yr
NNlamp countcount
clampc_{\text{lamp}}lamp purchase cost$/lamp
hhannual operationh/yr
LlifeL_{\text{life}}lamp lifeh

Related calculators

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