Recessed Light Spacing and How Far Apart to Put Downlights

Recessed lights are easy to get wrong. Space them too far apart and you get bright pools with dark gaps between them, too close and the ceiling looks like a slice of Swiss cheese while the room still feels flat. Getting recessed light spacing right is mostly arithmetic, and once you know the few numbers that matter you can lay out a room on a sheet of paper in ten minutes.

This is the method I use on residential jobs, with the rules of thumb, the exceptions, and the point where I ignore the standard advice.

The basic rule for recessed light spacing

The starting rule is simple: divide the ceiling height by two to get the distance between fixtures. A standard 8 foot ceiling (about 2.4 metres) gives roughly 4 feet (1.2 metres) between lights. A 10 foot ceiling gives about 5 feet. A 12 foot ceiling gives about 6 feet.

Then keep the first row of lights half that distance from the walls. On an 8 foot ceiling, that puts the outer lights about 2 feet (60 centimetres) from each wall.

Ceiling height	Spacing between lights	Distance from walls	Lights in a 12 x 14 ft room
8 ft (2.4 m)	About 4 ft (1.2 m)	About 2 ft (0.6 m)	9 to 12
9 ft (2.7 m)	About 4.5 ft (1.4 m)	About 2.25 ft (0.7 m)	6 to 9
10 ft (3 m)	About 5 ft (1.5 m)	About 2.5 ft (0.75 m)	6
12 ft (3.7 m)	About 6 ft (1.8 m)	About 3 ft (0.9 m)	4 to 6

This rule assumes general downlights with a beam angle around 60 degrees. That is a sensible default for most 4 inch and 6 inch residential fittings sold today.

Why beam angle changes everything

The halving rule works because a 60 degree beam spreads to about the same width as the ceiling height when it reaches the floor. Change the beam and the spacing has to change with it.

Narrow beams (24 to 36 degrees): great for accent lighting on art or a kitchen island, but spaced at 4 feet they leave dark gaps. Space them closer, or use them only as accents.
Medium beams (40 to 60 degrees): the standard for general light. Follow the halving rule.
Wide beams (90 to 120 degrees): soft and even, can be spaced a little wider, up to about two thirds of the ceiling height, but they also light the walls less dramatically.

Check the spec sheet before you mark the ceiling. If the manufacturer lists a spacing criterion, often written as SC or S/MH, multiply it by the mounting height for the maximum distance between fixtures. A spacing criterion of 0.5 on an 8 foot ceiling means 4 feet, which matches the rule above. If reading those documents is new, my notes on how to read a light fixture spec sheet walk through the key lines.

How to lay out recessed lights step by step

Draw the room to scale. One square on graph paper per 6 inches works well.
Mark the obstacles. Ceiling joists, ducts, smoke alarms, and any future ceiling fan or pendant position.
Mark the furniture zones. Sofa, bed, worktops, dining table. Light the zones, not just the floor area.
Place the outer row. Half the spacing distance in from each wall.
Fill the grid. Divide the remaining space as evenly as you can, rounding to keep rows symmetrical.
Check against joists. Move a light 2 or 3 inches rather than cutting a joist.

Symmetry from the room's main view point matters more than perfect maths. A row that is 3 inches off the ideal grid will not be noticed. A row that is visibly off centre from the fireplace will be noticed every evening.

Spacing by room

Kitchens

Kitchen downlights should sit over the front edge of the worktop, roughly 24 to 30 inches (60 to 75 centimetres) from the wall, not in the middle of the floor. Otherwise you stand in your own shadow while chopping. Spacing along the run can stay at the halving rule. Pair them with good under cabinet lighting for the worktop surface itself.

Living rooms

Here I often use fewer recessed lights than the grid suggests, because a living room should be lit in layers with lamps and wall lights doing much of the work. Our guide to layering light in a living room explains how that balance works.

Hallways

Run a single line down the centre, spaced 6 to 8 feet apart on an 8 foot ceiling, with a light near each door so nobody walks into a shadow.

Bathrooms

Put one fitting over the shower or bath, rated for wet locations, and avoid a light directly above the mirror. Light from straight above casts deep shadows under the eyes and chin.

Why more downlights is not always better

Many installers and online calculators aim for an even blanket of light, with a lumens-per-square-foot target and enough cans to hit it. I push back on that, because an evenly lit ceiling grid usually makes a home feel like an office.

Rooms feel comfortable when there is contrast: brighter on the walls and work surfaces, softer in the middle. A grid of 12 downlights in a 12 by 14 foot living room delivers plenty of light but throws it mostly onto the floor and the tops of people's heads. Six well placed fittings, two of them washing a feature wall, plus a floor lamp and a pair of sconces, will feel warmer and use less power.

So use the halving rule as a ceiling, not a target. Start with the grid, then remove any light that does not have a job.

Wall washing and the 18 to 24 inch rule

If you want to light a wall evenly, say a bookcase or a textured stone surface, move the outer row closer to it. Place wall washers about 18 to 24 inches (45 to 60 centimetres) from the wall and space them roughly the same distance apart as they are from the wall. That gives a smooth wash from ceiling to floor without the bright scallop shapes you get from fittings placed farther away.

Use a 2700K or 3000K colour temperature in living spaces for a warm feel, and keep every fitting in the room at the same temperature so the ceiling looks consistent.

Frequently asked questions

How far apart should 6 inch recessed lights be?

On an 8 foot ceiling, space 6 inch recessed lights about 4 feet apart and about 2 feet from the walls. On higher ceilings, divide the ceiling height by two. Check the beam angle, because a narrow beam needs closer spacing.

How many recessed lights do I need for a 12 x 12 room?

With an 8 foot ceiling, a 3 by 3 grid of nine lights gives even general light. For a bedroom or living room, four to six fittings plus lamps usually feels better than a full grid.

How far from the wall should recessed lights be?

For general lighting, about half the spacing distance, which is around 2 feet on an 8 foot ceiling. For washing a wall with light, move them to 18 to 24 inches from the wall.