Low Bay Lighting Calculator

Size LED low bay fixtures for spaces with 12–25 ft ceiling heights: workshops, small warehouses, gyms, and light manufacturing. Uses IES zonal cavity method.

Space & Task

Length 80 ft

Width 60 ft

Ceiling Height 18 ft

Work Plane Height 3 ft

Task / Application

Fixture Lumens 15000 lm

Fixture Wattage 100 W

Reflectance (ceiling/walls)

Light Loss Factor 0.80

Sizing Results

Floor area—

Room cavity ratio—

Required illuminance—

Total lumens required—

Fixtures needed—

Fixture spacing—

Total wattage—

Lighting power density—

ASHRAE 90.1 limit—

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fixtures

Count needed

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W/ft²

Power density

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Total load

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lm/W

System efficacy