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Lighting Power Density Calculator

Installed lighting watts per square foot against the allowance for the space, including credited controls.

Inputs

Space

Sets the screening allowance. Replace it with the space type in your local code edition.

Area served by the lighting being counted, not the whole building.

Switch to square metres for metric drawings.

Lighting and controls

Luminaires counted for this space.

Input wattage including the driver or ballast, from the fixture schedule.

Occupancy sensing, daylight dimming, and other credited controls as a share of connected power. Use the credit your code edition actually allows.

Result

Installed power density
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Installed power density (metric)
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Share of allowance
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Screening allowance
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Allowance for this area
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Headroom
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Connected load
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Load after controls credit
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Verdict
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What to check

  • Input wattage per fixture including driver or ballast losses
  • The allowance from the code edition that governs the project, with any space-by-space method applied
  • The control credits your code actually permits, evidenced in the sequence of operation

Related calculators

This calculator is a first-pass screen with representative allowance values. Verify against the adopted local code edition and the project drawings: power density is a permit item, and the numbers that matter are the ones in the submittal.

Saved calculations

Keep the assumptions with the result.

Save this calculation to return to the inputs, result, and report anytime.

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