ClueLuma

Fixture input power calculator

Include ballast input when estimating fixture power.

Wfixture=nlamp×Wlamp+WballastW_{\text{fixture}} = n_{\text{lamp}} \times W_{\text{lamp}} + W_{\text{ballast}}

Calculator

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

W
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W
W

Worked example

Given

  • WballastW_{\text{ballast}} = 6 W
  • nlampn_{\text{lamp}} = 2 —
  • WlampW_{\text{lamp}} = 32 W
Wfixture=2×32+6=70W_{\text{fixture}} = 2 \times 32 + 6 = 70

Symbols and units

SymbolMeaningUnit
WfixtureW_{\text{fixture}}total fixture inputW
WballastW_{\text{ballast}}ballast lossesW
nlampn_{\text{lamp}}lamps per fixture—
WlampW_{\text{lamp}}lamp wattsW

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.