ClueLuma

Relamping labor savings calculator

For equal counts, fewer replacements reduce relamping labor.

Slabor=N×Clabor×H×(1Lifeold−1Lifenew)S_{\text{labor}} = N \times C_{\text{labor}} \times H \times \left(\frac{1}{\text{Life}_{\text{old}}} - \frac{1}{\text{Life}_{\text{new}}}\right)

Calculator

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

h
h
$/replacement
—
h/yr
$/yr

Worked example

Given

  • Lifeold\text{Life}_{\text{old}} = 20,000 h
  • Lifenew\text{Life}_{\text{new}} = 50,000 h
  • ClaborC_{\text{labor}} = 6 $/replacement
  • NN = 400 —
  • HH = 4,000 h/yr
Slabor=400×6×4000×(120,000−150,000)=288S_{\text{labor}} = 400 \times 6 \times 4000 \times \left(\frac{1}{20{,}000} - \frac{1}{50{,}000}\right) = 288

Symbols and units

SymbolMeaningUnit
SlaborS_{\text{labor}}annual labor savings$/yr
Lifeold\text{Life}_{\text{old}}old service lifeh
Lifenew\text{Life}_{\text{new}}new service lifeh
ClaborC_{\text{labor}}labor per replacement$/replacement
NNmaintained lamps or fixtures—
HHannual useh/yr

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