400 sq ft
20×20 room:
20×20 room:
how many lights?
A 20×20 ft room is 400 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 9 to 36 fixtures at 800 lumens each.
Pick the room type below for the full layout, spacing and ceiling plan.
A 20×20 room, by what it is used for
| Room type | Target | Total lumens | Fixtures | Grid | Spacing |
|---|---|---|---|---|---|
| Kitchen | 300 lx | 20,561 lm | 25 | 5 × 5 | 4′ × 4′ |
| Living room | 150 lx | 12,013 lm | 16 | 4 × 4 | 5′ × 5′ |
| Bedroom | 100 lx | 8,009 lm | 9 | 3 × 3 | 6.7′ × 6.7′ |
| Bathroom | 200 lx | 16,018 lm | 20 | 4 × 5 | 5′ × 4′ |
| Home office | 300 lx | 21,223 lm | 30 | 5 × 6 | 4′ × 3.3′ |
| Dining room | 150 lx | 10,611 lm | 16 | 4 × 4 | 5′ × 5′ |
| Garage | 150 lx | 12,013 lm | 16 | 4 × 4 | 5′ × 5′ |
| Hallway | 100 lx | 8,009 lm | 9 | 3 × 3 | 6.7′ × 6.7′ |
| Laundry | 200 lx | 13,707 lm | 16 | 4 × 4 | 5′ × 5′ |
| Basement | 150 lx | 12,013 lm | 16 | 4 × 4 | 5′ × 5′ |
| Workshop | 400 lx | 27,415 lm | 36 | 6 × 6 | 3.3′ × 3.3′ |
| Nursery | 100 lx | 8,009 lm | 9 | 3 × 3 | 6.7′ × 6.7′ |
At 800 lumens per fixture and an 8 ft ceiling. Click a room type for other fixture sizes and ceiling heights.
Questions
How many recessed lights for a 20x20 room?
It depends what the room is for. A 20×20 ft (400 sq ft) living room needs about 16 fixtures at 800 lm; the same footprint as a kitchen needs about 25, because a kitchen is lit to roughly double the level. Pick the room type for the real answer.
How many square feet is a 20x20 room?
400 square feet, or 37.2 square metres.