Recessed Lighting Calculator – Layout & Spacing Guide
Calculate recessed light placement and spacing
Table of Contents
How to Use
- Enter room dimensions (length and width)
- Specify ceiling height
- Enter spacing rule (typically 2 for ceiling height ÷ 2)
- Select unit system (feet or meters)
- Click calculate to get lighting layout
Recessed Lighting Spacing Basics
Proper spacing of recessed lights ensures even illumination without dark spots or excessive brightness. The most common rule is to divide the ceiling height by 2 to determine spacing between lights.
For example, with an 8-foot ceiling, lights should be spaced 4 feet apart. Lights should also be positioned approximately half this distance from walls.
Common Spacing Rules
- Standard rule: Ceiling height ÷ 2 = spacing between lights
- Closer spacing (÷ 2.5): For task lighting or darker surfaces
- Wider spacing (÷ 1.5): For accent lighting or bright surfaces
- Distance from wall: Half the spacing between lights
- Typical range: 4-6 feet between fixtures for 8-10 foot ceilings
Choosing Fixture Size
| Ceiling Height | Fixture Size | Typical Use |
|---|---|---|
| 8 feet or less | 4-5 inches | Standard residential |
| 9-10 feet | 5-6 inches | High ceiling residential |
| 11-12 feet | 6-7 inches | Very high ceilings |
| Over 12 feet | 7-8 inches | Commercial/cathedral |
Room-Specific Considerations
- Kitchen: Closer spacing over work areas, 3-4 feet apart
- Living room: Standard spacing, consider dimmers
- Bathroom: Focus lighting over vanity and shower
- Bedroom: Wider spacing acceptable, use dimmers
- Hallway: Space evenly, typically every 6-8 feet
- Closet: One fixture for small, multiple for walk-ins
Installation Best Practices
- Check ceiling for joists, ducts, and wiring before cutting
- Maintain proper clearance from insulation (IC-rated fixtures)
- Use appropriate housing type (new construction vs. remodel)
- Consider dimmer switches for flexibility
- Match color temperature across all fixtures (2700K-3000K warm)
- Calculate total wattage and ensure circuit capacity
- Hire licensed electrician for installation
- Follow all local electrical codes
Frequently Asked Questions
- How do I calculate recessed lighting spacing?
- Use the standard formula: ceiling height ÷ 2 = spacing between lights. For an 8-foot ceiling, space lights 4 feet apart. Place lights half this distance (2 feet) from walls. Adjust based on room use and fixture lumens.
- How many recessed lights do I need?
- This depends on room size, ceiling height, and fixture brightness. As a general guide, use one light per 25-30 square feet for standard 8-foot ceilings with 650-lumen fixtures. This calculator provides specific recommendations based on your dimensions.
- What size recessed lights should I use?
- For 8-foot ceilings, use 4-5 inch fixtures. For 9-10 foot ceilings, use 5-6 inch. For higher ceilings, use 6-8 inch. Larger fixtures provide more light spread but require more clearance above the ceiling.
- How far should recessed lights be from the wall?
- Place lights approximately half the distance of your light spacing from walls. If lights are 4 feet apart, position them 2 feet from walls. This prevents dark corners and ensures even illumination.
- Can I install recessed lighting myself?
- While DIY installation is possible with electrical knowledge, hiring a licensed electrician is recommended for safety and code compliance. Improper installation can create fire hazards and void insurance coverage.
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