Recessed lighting layout calculator

💡 Recessed Lighting Tool

Recessed Lighting Layout Calculator

Calculate fixture count, spacing, beam spread, and coverage for any room. Choose your layout strategy, fixture size, and beam angle — then see the optimised floor plan instantly.

Layout Strategy

Width (ft)

Length (ft)

Ceiling Height

Room Type

Fixture Size

2″

3″

4″

6″

Beam Angle

24° Narrow

38° Medium

60° Flood

90° Wide

Wall Wash

Coverage

Beam overlap

Light count

Spacing

Recessed fixture Beam spread Dark zone Good coverage

Layered Lighting for This Room

Lumen Density by Room Type

Trim & Optic Selector

Trim Type	Best For	Beam Control	Notes
Baffle trim	Living rooms, bedrooms	Medium	Black baffles reduce glare; most popular residential choice.
Regressed / flush	Modern interiors	High	Aperture sits above ceiling plane — ultra-clean look, less glare.
Adjustable gimbal	Artwork, accents, sloped ceilings	High (directional)	Tilts up to 35°. Essential for accentuating objects or walls.
Wall wash trim	Gallery walls, texture	Asymmetric	Optic sends 90% of light toward one wall. Creates dramatic vertical illumination.
Pinhole / slot	Luxury, minimal	Very high	Tiny visible aperture, very tight beam. Architectural-grade look.
Wet-rated trim	Bathrooms, shower areas	Standard	IP65+ rated. Required within 3ft of shower or tub.
Decorative ring	Traditional homes	Low	Visible trim ring adds character but can look dated in modern contexts.

Fixture Size Guide

Avoid These Mistakes

Lights too close to walls

Fixtures within 12–18″ of a wall create harsh scallops. Minimum 18–24″ from wall unless using wall-wash optics.

Oversized apertures

6″ cans in a 9ft ceiling feel heavy and dated. 3–4″ fixtures with precise optics look more intentional and professional.

Perfect symmetry obsession

A symmetrical grid centered on the room looks wrong in most rooms. Center on the furniture zone, not the ceiling.

Over-lighting the room

More lights ≠ better room. Excess downlights flatten everything, kill shadows, and create an interrogation-room feel. Always pair with dimmers.

TV glare from ceiling lights

Never place recessed lights directly in front of a TV screen. Overhead lights behind the viewer or to the side eliminate reflections.

No dimmer circuit

Recessed lighting without dimmers is useless for ambience. 0-10V or TRIAC dimmers are mandatory for any living or dining space.

Uneven spacing

Irregular spacing looks accidental. Use calculated intervals and stick to them — even if it means slightly fewer fixtures.

Ignoring beam overlap

Adjacent fixtures should overlap 20–40% for even floor illumination. Under 10% creates dark circles between lights.

Common recessed lighting mistakes

These are the errors that cost the most — because fixing them requires reopening the ceiling

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Lights over the counter, not in front of it — A downlight directly above upper cabinets illuminates the cabinet top and casts shadows on the counter. Position the first row 18–24 inches from the cabinet face so it shines down on the work surface.

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Too few fixtures, too bright per fixture — One powerful recessed light creates a spotlight effect with hot spots and dark zones. Better to use more fixtures at lower wattage for even, comfortable illumination. Target 60–69% beam overlap.

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Wrong beam angle for the ceiling height — A 24° narrow beam from a 9ft ceiling produces a tight pool of light. Use 38–60° for residential ceilings under 10ft. Save narrow beams for accent lighting on art and architecture.

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No dimmer installed — Recessed lighting without dimming means you choose between off and full brightness. Every residential recessed circuit needs a TRIAC or 0–10V dimmer. 30–60% is the everyday sweet spot.

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Recessed light directly above the TV — A downlight above a TV screen creates a reflection spot and glare that washes out the image. Keep all recessed lights at least 4ft from the front face of the TV panel.

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Mismatched CCT between rooms — Mixing 2700K and 4000K recessed lights across adjacent rooms looks jarring when both spaces are visible. Commit to one CCT per open-plan zone. 3000K works universally across residential spaces.