The Basic Spacing Rule

A widely used starting point is to divide the ceiling height by two - the result is roughly how far apart, in feet, your recessed lights should be for even general (ambient) lighting. On a standard 8-foot ceiling, that works out to about 4 feet between fixtures. On a 9- or 10-foot ceiling, you can space 6-inch lights closer to 4.5-5 feet apart, since the extra height lets the light spread further before it reaches the floor.

Adjust for Fixture Size and Purpose

That's a starting point, not a fixed rule - the right spacing also depends on:

  • Fixture size: 6-inch downlights throw a wider pool of light than 4-inch fixtures, so they can be spaced further apart for the same coverage.
  • Purpose: ambient (general room) lighting tolerates wider, more even spacing; task lighting over a counter or desk needs tighter spacing directly above the work area; accent lighting on art or architectural features is placed individually rather than in a grid.
  • Beam angle: a narrow-beam trim concentrates light in a smaller pool and needs closer spacing than a wide-flood trim of the same wattage.

Distance from Walls

Keep the first row of lights roughly 2 to 3 feet in from the walls. Lights placed too close to a wall create a bright hot spot low on the wall with a dark ceiling above it; positioned correctly, they wash the wall evenly and make the room feel larger. For a deliberate wall-wash effect (common in hallways or over cabinetry), some designers place fixtures even closer - about 12-24 inches from the wall - using wall-wash trims designed for that purpose.

Kitchens and Task Areas

Over a kitchen island or counter, plan spacing around the specific work areas rather than a uniform grid: center fixtures over the counter edge, not the wall behind it, so the light falls on the work surface and not on the person standing at it. A common approach is two or three 4-inch or 6-inch lights spaced about 24-30 inches apart directly above a run of counter.

Bathrooms

In an average-size bathroom, one fixture centered over a shower or tub (rated for damp or wet locations as appropriate) plus one or two more for general lighting is typical; larger bathrooms may need a small grid using the same height-based spacing rule.

A Simple Way to Check Your Plan

Before committing to fixture locations, mark them on the ceiling with painter's tape, or sketch the room to scale, and stand where you'll actually use the space - at the stove, the vanity, the reading chair - to see whether the layout leaves shadows where you need light most. It's much cheaper to move a piece of tape than to reroute wiring after installation.

Safety Note

Any change to fixture locations on an existing ceiling means new wiring runs. Turn off power at the breaker before working on any circuit, and if adding new lighting circuits or running cable through finished walls and ceilings, hire a licensed electrician - most US jurisdictions also require a permit and inspection for new lighting circuits.