18×24 room:
how many lights?
12–36fixtures A 18×24 ft room is 432 square feet. How many lights it needs depends entirely on what happens in it — a kitchen is lit to roughly twice the level of a bedroom, so the same footprint ranges from 12 to 36 fixtures at 800 lumens each.
The footprint does not decide the count. The target illuminance does, and that is set by what the room is for.
SOURCE·IES lumen-method recommendations·published recommendations, quoted as ranges·REVIEWED JUL 2026
Plan above: the 18×24 ft footprint laid out as a living room at 150 lux, with iso-lux contours at 32 / 21 / 11 lux.
Schedule · by useOne 18×24 footprint, twelve commissioning targets
| Room type | Target | Total lumens | Fixtures | Grid | Spacing |
|---|---|---|---|---|---|
| Kitchen | 300 lx | 22,035 lm | 30 | 6 × 5 | 4′ × 3.6′ |
| Living room | 150 lx | 12,848 lm | 16 | 4 × 4 | 6′ × 4.5′ |
| Bedroom | 100 lx | 8,565 lm | 12 | 4 × 3 | 6′ × 6′ |
| Bathroom | 200 lx | 17,130 lm | 20 | 5 × 4 | 4.8′ × 4.5′ |
| Home office | 300 lx | 22,706 lm | 30 | 6 × 5 | 4′ × 3.6′ |
| Dining room | 150 lx | 11,353 lm | 15 | 5 × 3 | 4.8′ × 6′ |
| Garage | 150 lx | 12,848 lm | 16 | 4 × 4 | 6′ × 4.5′ |
| Hallway | 100 lx | 8,565 lm | 12 | 4 × 3 | 6′ × 6′ |
| Laundry | 200 lx | 14,690 lm | 20 | 5 × 4 | 4.8′ × 4.5′ |
| Basement | 150 lx | 12,848 lm | 16 | 4 × 4 | 6′ × 4.5′ |
| Workshop | 400 lx | 29,379 lm | 36 | 6 × 6 | 4′ × 3′ |
| Nursery | 100 lx | 8,565 lm | 12 | 4 × 3 | 6′ × 6′ |
At 800 lumens per fixture and an 8 ft ceiling. Open a room type for other fitting outputs, other ceilings and its own contour sheet.
SOURCE·IES lumen-method recommendations·published recommendations, quoted as ranges·REVIEWED JUL 2026
QueriesWhat this footprint is usually asked
How many recessed lights for a 18x24 room?
It depends what the room is for. A 18×24 ft (432 sq ft) living room needs about 16 fixtures at 800 lm; the same footprint as a kitchen needs about 30, because a kitchen is lit to roughly double the level. Pick the room type for the real answer.
How many square feet is a 18x24 room?
432 square feet, or 40.1 square metres.
