Light Spacing Calculator
Get the perfect recessed light layout. Enter your room dimensions and ceiling height to calculate optimal spacing and the number of lights you need.
1Room & Light Details
Standard recessed can lights or pot lights
2Spacing Layout
12
lights needed
4 × 3 grid
Spacing Between
4.0 ft
Wall Offset
2.0 ft
Layout Preview
Spacing Guidelines
- ✓First light should be half the spacing distance from walls
- ✓Avoid placing lights directly over furniture or work areas
- ✓Use more lights with lower wattage for even distribution
The Golden Rule of Light Spacing
The standard rule for recessed lighting: space lights at half the ceiling height. For an 8-foot ceiling, lights should be about 4 feet apart. This ensures even light distribution without dark spots or harsh overlapping.
Spacing by Ceiling Height
| Ceiling Height | Recommended Spacing | Wall Offset |
|---|---|---|
| 8 ft (2.4m) | 4 ft (1.2m) | 2 ft (0.6m) |
| 9 ft (2.7m) | 4.5 ft (1.4m) | 2.25 ft (0.7m) |
| 10 ft (3m) | 5 ft (1.5m) | 2.5 ft (0.75m) |
| 12 ft (3.6m) | 6 ft (1.8m) | 3 ft (0.9m) |
Wall Offset Rule
Wall Offset = Light Spacing ÷ 2
The first row of lights should be placed at half the spacing distance from the wall. This prevents dark corners and creates balanced illumination across the entire room.
Light Type Considerations
Recessed (4-6" cans)
Standard spacing at half ceiling height. Most common for general room lighting. Choose 4" for lower ceilings, 6" for higher.
Track Lighting
Can be spaced slightly wider (60% of ceiling height) since heads are adjustable and can be aimed.
Pendant Lights
Decorative focus. Spacing can be 70% of ceiling height. Consider visual balance over pure illumination.
Spotlights
Tighter spacing (40% of ceiling height) for focused, dramatic lighting or task areas.
Common Mistakes to Avoid
- ✗
Lights Too Close to Walls
Creates harsh shadows on walls (wall washing). Maintain the half-spacing offset from walls.
- ✗
Spacing Too Wide
Creates dark spots (scalloping) on the ceiling between lights. Results in uneven illumination.
- ✗
Ignoring Furniture Placement
Don't place lights directly above where people sit. Consider furniture layout when planning.
- ✓
The Right Approach
Draw a grid on paper first, then adjust for obstacles like beams, HVAC vents, and furniture.