A workable rule of thumb: the distance between two spots is roughly the ceiling height divided by two. With a ceiling of 2.60 meters that comes to about 1.30 meters between the spots, and around 60 to 80 cm to the wall.
Why ceiling height sets the measurement
A spot lights a circle on the floor, and that circle grows the higher the spot hangs. In a tall room the light cones therefore overlap sooner and the spots may sit further apart. In a low ceiling the same spacing leaves dark patches between the spots.
Halve the ceiling height and you keep a slight overlap between the cones. That is exactly what you want: no stripes, no gaps.
Three standard situations
- Ceiling 2.40 m — spots about 1.20 m apart
- Ceiling 2.60 m — about 1.30 m
- Ceiling 3.00 m — about 1.50 m
This rule is for general ceiling light. Accent lighting above a counter or a painting follows different distances, because there you want a concentrated beam on one spot.
The distance to the wall is half
This is where it most often goes wrong. Hang the outer row of spots as far from the wall as they are from each other, and the wall stays dark and the room looks smaller than it is.
So take about half the spacing, meaning 60 to 80 cm with an average ceiling. The wall then gets lit along with everything else, which makes a room look larger. Hang them too close to the wall and you get a bright stripe on the wallpaper and see every imperfection in the plaster.
Look at the beam angle of your spot
The rule of thumb assumes an ordinary wide beam. With a narrow-beam spot the circle on the floor is smaller and the spots have to sit closer together. With a wide beam you can space them further apart.
With a tiltable spot you can steer some of this: aim the outer spots slightly towards the wall and the inner ones straight down. That gives you a more even result with fewer spots.
Work out your number first, then divide
The order matters. First establish how many lumens you need and how many spots that comes to, and only then spread them across the ceiling. If you land on six spots in a room of 4 by 5 meters, that becomes two rows of three — not a grid of eight because eight happens to work out neatly at 1.30 meters.
Sketch it out before you start cutting. Also check where the joists are: a spot that lands exactly on a joist has to move anyway.
Symmetry counts for more than the rule
A ceiling where the spots sit neatly at 1.30 meters but skewed relative to the room looks worse than a ceiling where they sit at 1.45 meters and line up tidily with the walls. Split the remaining space evenly across the edges and keep the rows parallel to the shortest wall.
Feel free to deviate 10 to 20 centimeters from the rule of thumb if the room asks for it. Nobody sees that; everybody sees a crooked row.
What you can still correct
Once everything is in and it is still too bright or too flat, a dimmer is the cheapest correction. Choose spots with a dimmable driver and a suitable dimmer; see the dimmer guide. You work out the number of spots per room with How many lumens do you need per room?, and the range is with the recessed spotlights.
How far apart should spots be with a 2.60 meter ceiling?
About 1.30 meters between the spots and 60 to 80 cm to the wall.
How far should spots be from the wall?
About half the spacing between them. Further away leaves the wall dark, closer gives a bright stripe on the wallpaper.
Does the spacing have to be exactly equal everywhere?
Symmetry matters more than the exact measurement. Feel free to deviate by ten centimeters to line the rows up neatly with the walls.