The Lighting Layout Calculator applies the lumen method to a room. Target illuminance, fixture output, utilization and maintenance factors give the number of fixtures required, an approximate spacing, and the lux actually achieved.
Lighting Layout / Spacing Calculator (Lux Level per Room)
Apply the lumen method to size and lay out lighting: fixture count, a suggested row and column grid, spacing, spacing-to-height ratio check and the lux actually achieved.
Room
Target and fixture
Factors
Results
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fixtures needed
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achieved lux
Notes
About Lighting Layout / Spacing Calculator (Lux Level per Room)
Features
- Room dimensions and area
- Target illuminance in lux
- Fixture lumen output
- Utilization and maintenance factors
- Fixture count, spacing and achieved lux
How to Use
- Enter room length, width and target lux.
- Enter fixture lumens with the UF and MF percentages.
- Read the fixture count, spacing and achieved level.
Examples
Example: a 6 x 4 m room at 300 lux with 3000 lm fixtures (UF 70%, MF 80%) -> 5 fixtures at about 2.19 m spacing, achieving 350.0 lx.
Benefits
- Achieved lux is shown, so rounding up stays a visible decision
- The spacing figure gives a starting grid for the layout
Frequently Asked Questions
What does this calculator do?
Apply the lumen method to size and lay out lighting: fixture count, a suggested row and column grid, spacing, spacing-to-height ratio check and the lux actually achieved.
Is my data stored?
No. Everything runs in your browser; nothing is uploaded, saved or logged.