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RECESSED LIGHTS NEEDED
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Suggested Spacing
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between fixtures
Room Area
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sq ft
Est. Total Watts
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at 9W per LED
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Can Light Spacing Rules of Thumb

Recessed lighting placement depends on ceiling height, room purpose, and desired brightness level. The most reliable rule: space fixtures at half the ceiling height.

Spacing = Ceiling Height / 2  |  From Wall = Spacing / 2
For 9ft ceiling: space lights 4.5ft apart, place first light 2.25ft from wall. Number of lights = Room Area / (Spacing x Spacing) adjusted for the actual grid.
Ceiling HeightRecommended SpacingFrom Wall
8 feet4 feet apart2 feet from wall
9 feet4.5 feet apart2.25 feet from wall
10 feet5 feet apart2.5 feet from wall
12 feet6 feet apart3 feet from wall

Frequently Asked Questions

General rule: 1 recessed light per 4–6 sq ft for kitchens, 1 per 20–25 sq ft for ambient living space lighting. These rules assume 8–9 ft ceilings and standard 6-inch 800–1000 lumen fixtures.

Space them at half the ceiling height. For 8ft ceilings: 4ft apart. For 9ft: 4.5ft. For 10ft: 5ft. Place the first row of lights 2ft from the wall for ambient lighting, or 12–18 inches for wall washing.

6-inch fixtures are the most popular for living rooms and general lighting. 4-inch work well in kitchens and bathrooms. 5-inch is a great compromise. LED retrofits are available for all sizes.

LED recessed lights (8–12W) replace 65W incandescent bulbs, using 85% less energy. A 9W LED typically produces 700–1000 lumens — equivalent to a 60–75W bulb.

A 15-amp circuit supports about 1,440W continuously. At 9W per LED, that is 160 fixtures per circuit — far more than any room needs. In practice, a room is often on one 15A circuit with a dimmer.

Dimmers are highly recommended for recessed lighting. They allow you to adjust ambiance and save energy. Make sure to use LED-compatible (trailing-edge TRIAC) dimmers to avoid buzzing or flickering.

Sources & Methodology
Spacing formula based on IES (Illuminating Engineering Society) lighting design guidelines and standard contractor practice.
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IES — Illuminating Engineering Society
Standard lighting design recommendations including recessed fixture spacing ratios and ceiling height rules
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NECA — National Electrical Contractors Association
Electrical installation standards for recessed lighting circuits, load calculations, and wiring
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DOE — Energy.gov Lighting Facts
LED efficacy data, wattage equivalents, and energy savings from incandescent-to-LED conversion
Last updated: March 2026
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