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Lighting Layout & Spacing Calculator
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Living Room Recessed Lighting Layout

Design a code-compliant lighting plan with precise fixture spacing.

Quick Answer

For a 20x15 living room, you want relaxed ambient lighting (20 FC). Use about 6 standard 800-lumen recessed cans in a 2x3 grid for even coverage without glare.

This calculator uses the Lumen Method (Zonal Cavity Method) to estimate the number of fixtures required to achieve a desired light level.

Brightness Targets

  • Standard (30 FC): General purpose rooms, dining, hall.
  • Bright (50 FC): Kitchens, workshops, offices.
  • Relaxed (20 FC): Living rooms, bedrooms.

Layout Tips

  • Even Spacing: Calculated to distribute light uniformly.
  • Wall Spacing: Should be half the fixture-to-fixture spacing.

1Room Parameters

- ft
ft
- ft
ft
- ft
ft
-

2Lighting Requirements

- fc
fc
- lm
lm
-

Fixtures Needed

-Lights
-
Grid Layout-
Avg Spacing-
Target Illuminance-

3

15ft
20ft
Placement Detail
1.88ft
3.75ft
2ft
4ft

Popular lighting Configurations

Garage Workshop Lighting CalculatorLiving Room Recessed Lighting Layout

Lighting Spacing Formula

S = Lroom / Nfixtures
Distance to wall = S / 2

Lighting Power Density

While NEC focuses on safety, energy codes (like IECC or Title 24) limit Lighting Power Density (Watts per sq ft). LED fixtures help meet these stringent efficiency requirements.

Frequently Asked Questions

How far apart should recessed lights be?

A common rule of thumb is to divide the ceiling height by 2. For an 8ft ceiling, space lights about 4ft apart.

How far should lights be from the wall?

For even illumination, place the first row of lights at a distance equal to half the spacing between lights. If lights are 6ft apart, place them 3ft from the wall.

How many lumens do I need for a room?

Living rooms typically need 20-30 lumens per sq ft. Kitchens and workspaces need more, typically 30-50 lumens per sq ft.