How many recessed lights for a 16 × 24 ft garage?
| Layoutacross the 16 ft dimension × along the 24 ft dimension | 4 × 6 |
|---|---|
| Spacing (rule of thumb)half of the 8 ft ceiling | 4ft |
| Actual spacing to mark outafter rounding to whole fixtures | 4 × 4ft |
| First light from the wallhalf a spacing — closer washes the wall, further leaves dark corners | 2 × 2ft |
| Room area | 384ft² |
| Target light levelwork surface levels, not storage levels | 50fc |
| Total lumens needed | 19,200lm |
| Lumens per fixtureabout 11 W each in LED | 800lm |
Notes
- The spacing rule is ceiling height ÷ 2, which gives 4 ft here. Rounding to whole fixtures moves it to 4 × 4 ft — mark the ceiling off the real numbers, not the rule.
- 800 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 either size covers it.
- 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 4 × 6 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.
The grid
Spacing for recessed cans is ceiling height divided by two. A 8 ft ceiling gives 4 ft, which across a 16 × 24 ft room works out to a 4 × 6 grid — 24 lights.
Rounding to whole fixtures moves the real spacing to 4 × 4 ft. Mark the ceiling off those numbers, not off the rule of thumb. The first row sits 2 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
384 ft² at 50 footcandles needs 19,200 lumens in the room, which is 800 lumens per fixture — around 11 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 4 × 6 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.
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Read more
- Downlights in a Bathroom: How Many, and the Zone That Decides the RatingReflective surfaces mean a bathroom needs less light than the arithmetic suggests, and the one place downlights cannot serve is the mirror.
- Why Downlights Are Uncomfortable to Sit Under, and What Fixes ItThe problem is not how much light there is. It is that a very small, very bright object is sitting in your field of view every time you look up.
- Replacing Halogen Downlights With LED: The Four Things That ChangeThe lamp fits and the ceiling looks the same. Beam angle, the dimmer and the transformer all changed underneath, and each one has its own failure.
- The Fan Runs and the Mirror Still Fogs — Six Causes, in OrderThe fan is rarely broken. It is usually starved of make-up air, fighting its own ductwork, or being switched off twenty minutes too early.