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Calculate the optimal number, spacing, and layout of recessed lights for any room. Our calculator considers room size, ceiling height, and lighting requirements to create the perfect lighting design for your space.
Last updated: February 2, 2026
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Affects optimal spacing calculation
Total Lights: 3
Grid Layout: 4 × 3
Spacing: 4.0 ft
Total Wattage: 54W
Required Lumens: 3,840
Per Light: 1400 lumens
Light Size: 6 inch
Per Light: 18W
For a typical 16' × 12' living room with 9-foot ceilings:
3
Recessed Lights
4 × 3
Grid Layout
4.0 ft
Spacing
54W
Total Power
Our recessed lighting calculator uses industry-standard lighting design principles to determine the optimal number and placement of recessed lights. The calculation considers room dimensions, ceiling height, room type, and light specifications to create a balanced lighting layout.
Required Lumens = Room Area × Lumens per Sq FtNumber of Lights = Required Lumens ÷ Light OutputSpacing = Ceiling Height ÷ 2 (minimum 4 feet)This method ensures adequate illumination while maintaining proper spacing for even light distribution across the room.
Shows optimal grid spacing and wall distances
Different rooms require different lighting levels based on their function and activities:
Planning other room improvements? Check out our TV wall mount calculator and wainscoting calculator.
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Total Lights
3 × 2
Grid Layout
5.3 ft
Spacing
108W
Total Wattage
Result: Install 6 recessed lights in a 3×2 grid with 5.3-foot spacing
This provides even illumination with 8,400 total lumens (44 lumens/sq ft).
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