ClueLuma

Ballast-factor output calculator

Ballast factor adjusts rated lamp lumens to the selected ballast.

Actual lumens=Rated lumens×BF\text{Actual lumens} = \text{Rated lumens} \times \mathrm{BF}

Calculator

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

lm
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lm

Worked example

Given

  • Rated lumens\text{Rated lumens} = 100 lm
  • BF\mathrm{BF} = 0.85 —
Actual lumens=100×0.85=85\text{Actual lumens} = 100 \times 0.85 = 85

Symbols and units

SymbolMeaningUnit
Actual lumens\text{Actual lumens}system light outputlm
Rated lumens\text{Rated lumens}reference ballast lamp outputlm
BF\mathrm{BF}relative output versus reference ballast—

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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.