General guideline: 1 recessed light per 4-6 square feet of ceiling space
Proper recessed lighting spacing depends on ceiling height, room function, and fixture wattage. For standard 8-foot ceilings, space lights 4-6 feet apart, creating a grid pattern that provides even illumination. Higher ceilings require fewer lights but brighter bulbs, while task areas like kitchens need more concentrated lighting at 3-4 foot intervals.
Room-by-room recessed lighting guidelines
- Living rooms: 1 light per 6-8 square feet for ambient lighting
- Kitchens: 1 light per 4-5 square feet, with additional task lighting over counters
- Bathrooms: 1 light per 4-6 square feet, plus vanity lighting
- Hallways: 1 light per 4-5 linear feet of ceiling
Calculating total lights needed
Measure room length × width = total square footage. Divide by spacing factor (4-6 for most rooms). Example: 12×16 ft room = 192 sq ft ÷ 5 = 38 lights maximum, but typically 20-25 lights create adequate coverage with 4-5 foot spacing.
Installation cost comparison
| Installation Method | Cost per Light | Time Required | Difficulty |
|---|---|---|---|
| Professional installation | $125-200 | 2-3 hours per room | Easy (contractor) |
| DIY with existing wiring | $40-80 | 4-6 hours per room | Moderate |
| New construction wiring | $150-250 | 1-2 days per room | Difficult |
Factors affecting light placement
Ceiling height determines spacing: multiply ceiling height by 1.5 for maximum spacing distance. Room function matters - kitchens need 50-75% more lights than living rooms. Beam angle of LED fixtures affects coverage; narrow beams (25-40°) need closer spacing than wide beams (60°+).
Common spacing mistakes to avoid
- Placing lights in rows creates tunnel effect - use staggered grid pattern
- Spacing lights too far apart leaves dark areas between fixtures
- Installing lights too close to walls creates harsh shadows
- Ignoring ceiling joists when planning layout requires fixture relocation