How Many Recessed Lights Do I Need?
Quick answer: space fixtures 6 feet apart, 3 feet from the walls, and hit 20–30 lumens per square foot for general light. A 12×12 room needs about 4–6 recessed lights; a 10×10 kitchen wants 6.
- The 6-foot spacing rule
- Lumens per room
- Fixture size and brightness
- Worked example: 12×12 living room
- Kitchens and task rooms
- FAQ
The 6-foot spacing rule
Recessed lights work best spaced about 6 feet apart, center-to-center, with the first row 3 feet from the wall. Divide the room length by 6 and round up for fixtures per row; do the same for width. A 12×12 room → 2 per row × 2 rows = 4 lights. Rooms with high ceilings (10 ft+) can space them a bit wider, 7–8 feet.
Lumens per room
The spacing rule and the light output should agree. Targets: 20–30 lumens/sq ft for living rooms, bedrooms and dining; 30–40 for kitchens and workspaces; 10–20 for hallways and storage. Multiply room area by the target, then divide by the lumens per fixture (700–800 for a standard 4-inch LED).
Fixture size and brightness
4-inch recessed housings with 700–800 lumen LED trims are the modern standard for general light. 6-inch housings throw wider pools of light and work in tall rooms or when you want fewer fixtures. 3-inch suits accent and task spots. Check the trim's lumens on the box — they range widely even in the same housing size.
Worked example: a 12×12 living room
- Area = 144 sq ft; target 25 lumens/sq ft → 3,600 lumens
- Spacing: 12 ÷ 6 = 2 per row × 2 rows = 4 fixtures
- 4 fixtures × 800 lumens = 3,200 lumens — adequate for general light
- Add a dimmer and one extra fixture over the seating area for flexibility → 5 total
Kitchens and task rooms
Kitchens want 30–40 lumens/sq ft. A 10×10 kitchen (100 sq ft) needs 3,000–4,000 lumens → 5–6 fixtures at 700 lumens. Islands and counters benefit from a row of lights directly above, plus under-cabinet task lights. Bathrooms get brighter too (30–40 lumens/sq ft), but keep fixtures away from the direct shower spray.
FAQ
Space recessed lights about 6 feet apart, with 2–3 feet from the wall, and count enough to hit 20–30 lumens per square foot for general light. A 12×12 room needs about 4–6 recessed lights.
About 6 feet apart center-to-center, with the first row 3 feet from the wall. Divide room length by 6 and round up for the count per row. In a 12×12 room that's 2 per row × 2 rows = 4 lights.
About 4–6 recessed lights for a 12×12 room. Four 4-inch lights with 700–800 lumens each give roughly 20 lumens per sq ft — comfortable general light. Six is better for kitchens.
About 20–30 lumens per square foot for general room light, 30–40 for kitchens and workspaces, 10–20 for bedrooms and hallways. Multiply area by the target, then divide by fixture lumens.
About 6 recessed lights for a 10×10 kitchen — kitchens want 30–40 lumens per sq ft, so 100 sq ft needs 3,000–4,000 total lumens, or 5–6 fixtures at 700 lumens each.