Simple Indoor Lighting Layouts

These estimators provides a rough lighting layout for industrial (high ceiling area) or office (low ceiling area) open spaces assuming average or typical surface reflectances on walls and ceilings. They are adequate for a “first pass” estimate. More accurate layouts can be done with the indoor design tool link available on the web page for the chosen fixture, or by using a commercial lighting layout program.

All numbers refer to initial lumens and footcandles only.

Area to be lit:
Ceiling height
Estimated FCU*
(Fixture Coefficient of Utilization)
1

Fixture Quantity Required

Footcandles required:

Fixture initial lumens:

CALCULATE

No. of fixtures needed:

Spacing (ft.):

2

Fixture Lumens Required

Footcandles required:

Spacing length x width (ft.):

X
CALCULATE

Lumens needed from fixture:

3

Footcandles
Estimated

Number of fixtures:

Fixture initial lumens:

CALCULATE

Average footcandles:

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