Lumens for
400 square feet
12,013lm ambient A 400 sq ft room (37.2 m²) needs roughly 12,013 lumens as a living room, rising to about 20,493 lumens as a kitchen and 21,114 lumens as a home office.
A lumen total is a budget, not a layout. It says nothing about whether the floor is even, which is the part the contour sheets on the footprint pages settle.
SOURCE·IES lumen-method recommendations·published recommendations, quoted as ranges·REVIEWED JUL 2026
Schedule · by use400 square feet, commissioned twelve ways
| Used as a | Target | Total lumens | 800 lm fixtures |
|---|---|---|---|
| Kitchen | 300 lx | 20,493 lm | 25 |
| Living room | 150 lx | 12,013 lm | 16 |
| Bedroom | 100 lx | 8,009 lm | 9 |
| Bathroom | 200 lx | 16,018 lm | 20 |
| Home office | 300 lx | 21,114 lm | 30 |
| Dining room | 150 lx | 10,557 lm | 16 |
| Garage | 150 lx | 12,013 lm | 16 |
| Hallway | 100 lx | 8,009 lm | 9 |
| Laundry | 200 lx | 13,662 lm | 16 |
| Basement | 150 lx | 12,013 lm | 16 |
| Workshop | 400 lx | 27,324 lm | 36 |
| Nursery | 100 lx | 8,009 lm | 9 |
Fixture counts assume a roughly square room at an 8 ft ceiling; a long, narrow 400 sq ft room has a lower room index and needs more.
SOURCE·Computed from the lumen method·no dataset, every figure reproducible with a calculator·REVIEWED JUL 2026
AdjacentTake it to a real footprint
Square footage is where a lighting question starts and never where it ends: two 400 sq ft rooms with different proportions have different room indices and different counts. Pick the actual dimensions on the footprint index and the sheet comes with contours drawn.
