For hallway ceiling light spacing, divide the hallway length in feet by 6, round to the nearest whole number, and that is your fixture count. Divide the length by that count for the gap between fixtures, then set the first and last fixture back from the end walls by half that gap. A 12 ft hall takes 2 fixtures at 72 in centers, 36 in off each end wall. A 16 ft hall takes 3 at 64 in centers, 32 in off each end.
Work the whole plan in inches. Feet and decimals are where these layouts go wrong: 16 divided by 3 is 5.33 ft, which is 64 in, and 64 in is a mark you can actually make with a tape. Small fixtures make the arithmetic easier to live with because they take up almost no ceiling. The Houseland ball fixture has a 7.9 in (20 cm) shade on a 4.7 in (12 cm) canopy and stands 9.4 in (24 cm) tall, so three in a row read as three small dots rather than three obstacles over your head.

What is the simplest hallway ceiling light spacing rule?
Length divided by 6 ft for the count, then length divided by the count for the spacing. The 6 ft step, about 72 in (183 cm), is the gap that stops a corridor reading as light, dark, light. This is the order I work in, and it takes one tape and a pencil.
- Measure the ceiling wall to wall, in inches. A 16 ft hall is 192 in. Write the number on the wall in pencil so you stop re-measuring.
- Divide the feet by 6 and round. 16 divided by 6 is 2.67, so 3 fixtures. Never round down below 1.
- Divide the inches by the count. 192 divided by 3 is 64 in center to center.
- Halve the spacing for the end setback. 64 divided by 2 is 32 in from each end wall.
- Mark from one end only. 32 in, 96 in, 160 in. Now check the last mark: 192 minus 32 is 160. If your marks do not close, you measured from both ends and the error is hiding in the middle gap.
- Move marks for obstacles, then re-check the gaps. I let a gap run about 6 in over or under the calculated spacing before I redo the maths.
The table covers the lengths I get asked about most. Every mark is measured from the same end wall.
| Hallway length | Fixtures | Center to center | Setback each end | Marks from one end wall |
|---|---|---|---|---|
| 8 ft (96 in) | 1 | n/a | 48 in, centered | 48 in |
| 10 ft (120 in) | 2 | 60 in | 30 in | 30, 90 |
| 12 ft (144 in) | 2 | 72 in | 36 in | 36, 108 |
| 16 ft (192 in) | 3 | 64 in | 32 in | 32, 96, 160 |
| 18 ft (216 in) | 3 | 72 in | 36 in | 36, 108, 180 |
| 20 ft (240 in) | 3 | 80 in | 40 in | 40, 120, 200 |
| 24 ft (288 in) | 4 | 72 in | 36 in | 36, 108, 180, 252 |
| 30 ft (360 in) | 5 | 72 in | 36 in | 36, 108, 180, 252, 324 |
Where do the first and last fixtures go so the ends do not look dark?
Back from each end wall by half the spacing, never by a full spacing. In a 192 in hall with 3 fixtures, half-spacing setbacks give gaps of 32, 64, 64 and 32 in, which walks evenly from door to door. Push those end fixtures to a full 64 in off the walls instead and they land at 64 in and 128 in with the middle one at 96 in, so the middle gaps shrink to 32 in and you are left with 5 ft 4 in of unlit ceiling at each end. That is the layout people describe as a bright patch in the middle of a dark hall.
If one end is a doorway with no wall, measure to the door casing and use the same half-spacing setback there. If the hall ends at the top of a stair, keep the last fixture within half a spacing of the top step, so you are not stepping down out of the light. On a hall with doors along one side, snap a single chalk line down the walking path and put every mark on that line, even if the path sits 2 in or 3 in off the true center of the ceiling.

What can I do if there is only one ceiling box in the middle of the hallway?
A single centered fixture lights the middle well and leaves both ends dimmer, and no shade size changes that. In a 16 ft hall the box sits 96 in from each end wall, and at twice the distance the same fixture is spreading its light over roughly four times as much floor, so the last 4 ft to 5 ft at each end reads darkest. That is usually exactly where the front door and the bedroom doors are.
Three honest options:
- Keep the one box and fill one end another way. Center the fixture on the walking path, then put something that plugs in at the dark end. If the cable turns out longer than the run needs, there are tidy ways to hide a wall light power cord, and the battery versus plug-in comparison covers which suits a hallway wall with no socket nearby.
- Add boxes and keep the one you have, if your count is odd. A 16 ft hall wants marks at 32, 96 and 160 in. 96 in is dead center, so the existing box stays and only 2 are new.
- Re-count if your number comes out even. A 12 ft hall wants 36 in and 108 in, and the old box at 72 in falls in the gap between them. Either have the electrician deal with the redundant box properly, or go to 3 fixtures at 48 in centers (marks 24, 72 and 120 in) so the middle one lands on the box you already have.
How much room do I leave around a door, a loft hatch, and the smoke alarm?
Clear the loft hatch's drop path first, keep the fixture off the alarm, and the door swing usually looks after itself. At 9.4 in (24 cm) tall on a 96 in ceiling, this fixture finishes about 86 in off the floor, above the top of a typical 80 in (203 cm) door leaf, so a swinging door passes under it. Measure your own ceiling before you rely on that, and if your ceiling is already low, the note on whether a fixture makes an 8 ft ceiling feel crowded is the one to read next.
The loft hatch is the real conflict. I leave at least 12 in (30 cm) between the canopy edge and the hatch opening, and I open the hatch with the ladder fully down before any mark becomes final, because the ladder stiles land further into the hall than people expect.
For the smoke alarm, check the clearance the alarm's own instructions ask for, then place the light outside it. Move the light, not the alarm. If one mark lands on the alarm, shift every mark by the same amount rather than nudging one: sliding all 3 marks 6 in keeps the gaps identical and only changes the setbacks, from 32 in and 32 in to 38 in and 26 in.
Joists come last. Mark first, then let the electrician tell you which mark has to move an inch or two. The 4.7 in (12 cm) canopy hides its own circle and nothing more, so an old paint ring or a hole wider than that stays visible after the new fixture goes up.
Does the same spacing math work in a kitchen, or is a track run better there?
The divide rule works fine for a kitchen walkway, but aiming light at a counter is a different job from lighting a corridor evenly. A kitchen wants light in specific places, which is what a track run does off a single box. A hallway wants the same light at 32 in as at 160 in, which is what separate fixtures on even centers do.
| What you are deciding | One track run | Separate ceiling fixtures |
|---|---|---|
| Boxes needed | One, usually the box already up there | One per fixture, so 3 marks means 3 boxes |
| Aiming after install | Heads pivot and slide along the rail | Position is fixed once it is wired |
| Changing the spacing later | Slide the heads, no rewiring | A new box for every change |
| What it reads as overhead | One continuous line | Separate 7.9 in (20 cm) shades on even centers |
| Suits | Counters, an island, one work zone | Corridors, entries, closets, even floor light |
For a corridor I fit separate fixtures on even centers every time. Houseland lists this ball fixture as a hardwired surface mount, so each of those positions needs its own box, its own power-off at the breaker, and a qualified electrician to mount the canopy and connect the ceiling wiring.

From the shop
Modern Ceiling Light, Adjustable Ball LED Hallway Fixture, 4 Colors
Houseland lists a 4.7 in (12 cm) canopy, a 7.9 in (20 cm) shade and 9.4 in (24 cm) total height, so a row of them on 64 in or 72 in centers stays small overhead. It is a hardwired surface mount fixture in Green, Blue, Yellow or Pink, and each color is the same size, so mixing them does not change your marks.
View the ball hallway ceiling light — 4 shade colours & current priceWhat do I mark on the ceiling before the electrician arrives?
Six things, and it takes about twenty minutes. Doing it before the quote is what keeps the job to one visit.
- Snap one chalk line down the center of the walking path, end wall to end wall.
- Mark the positions in inches from one end wall only and write the figure next to each cross, for example 32, 96, 160.
- Tape a 7.9 in (20 cm) paper circle at each mark so you can see the real footprint from both ends of the hall.
- Open the loft hatch with the ladder down and mark where the stiles land on the floor.
- Ring the smoke alarm position and note the clearance its instructions ask for.
- Photograph the ceiling with the tape in frame and send it with the length, the fixture count and the marks.
Then tell the electrician the fixture is a hardwired surface mount with a 4.7 in (12 cm) canopy, and hand over the list of marks. Everything after that is their side of the work.


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