ClueLuma

Retrofit demand reduction calculator

Subtract total new system input from old system input.

ΔkW=Nold×Wold−Nnew×Wnew1000\Delta \mathrm{kW} = \frac{N_{\text{old}} \times W_{\text{old}} - N_{\text{new}} \times W_{\text{new}}}{1000}

Calculator

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

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W
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kW

Worked example

Given

  • NoldN_{\text{old}} = 200 —
  • WoldW_{\text{old}} = 112 W
  • NnewN_{\text{new}} = 200 —
  • WnewW_{\text{new}} = 50 W
ΔkW=200×112−200×501000=12.4\Delta \mathrm{kW} = \frac{200 \times 112 - 200 \times 50}{1000} = 12.4

Symbols and units

SymbolMeaningUnit
ΔkW\Delta \mathrm{kW}connected power reductionkW
NoldN_{\text{old}}old fixture count—
WoldW_{\text{old}}old complete-fixture inputW
NnewN_{\text{new}}new fixture count—
WnewW_{\text{new}}new complete-fixture inputW

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.