Recessed lights for a 8 × 14 ft garage with a 11 ft ceiling
| Layoutacross the 8 ft dimension × along the 14 ft dimension | 1 × 3 |
|---|---|
| Spacing (rule of thumb)half of the 11 ft ceiling | 5.5ft |
| Actual spacing to mark outafter rounding to whole fixtures | 8 × 4.7ft |
| First light from the wallhalf a spacing — closer washes the wall, further leaves dark corners | 4 × 2.3ft |
| Room area | 112ft² |
| Target light levelwork surface levels, not storage levels | 50fc |
| Total lumens needed | 5,600lm |
| Lumens per fixtureabout 25 W each in LED | 1,867lm |
- Room width
- 8 ft
- Room length
- 14 ft
- Ceiling height
- 11 ft
- Room
- garage
The grid
Spacing for recessed cans is ceiling height divided by two. A 11 ft ceiling gives 5.5 ft, which across a 8 × 14 ft room works out to a 1 × 3 grid — 3 lights.
Rounding to whole fixtures moves the real spacing to 8 × 4.7 ft. Mark the ceiling off those numbers, not off the rule of thumb. The first row sits 4 ft from the wall — half a spacing. Closer and you get a bright band down the wall; further and the corners go dark.
What to buy, not just how many
112 ft² at 50 footcandles needs 5,600 lumens in the room, which is 1,867 lumens per fixture — around 25 W in LED.
That is the number to shop by, and it is the one most layout calculators leave out. A 4″ LED downlight typically runs 600–800 lm; a 6″ runs 800–1,200 lm.
Before you cut
Find the joists first. A 1 × 3 grid rarely lands clear of framing on the first attempt, and shifting a can six inches to miss a joist is invisible once the trim is on. Put the whole layout on a dimmer while the wiring is open — it costs almost nothing then and cannot be added cheaply later.
Notes
- The spacing rule is ceiling height ÷ 2, which gives 5.5 ft here. Rounding to whole fixtures moves it to 8 × 4.7 ft — mark the ceiling off the real numbers, not the rule.
- 1,867 lumens per can is the figure to shop by. A 4″ LED downlight typically runs 600–800 lm and a 6″ runs 800–1,200 lm, so this room wants 6″ cans, or more of them.
- Garage is a task space. 50 fc is the general level — countertops, desks and mirrors still need their own light. Ceiling cans alone put the light behind you and your own shadow onto the work.
- Put them on a dimmer. It costs almost nothing at install, and it is the difference between a ceiling that works at dinner and one that works at 11pm.
- Check the joists before marking. A 1 × 3 grid rarely lands clear of framing on the first try, and moving a can 6 inches to miss a joist is invisible once the trim is on.
Nearby sizes
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