Lighting Terms
Recessed Lighting
Recessed lighting is a fixture installed into a hollow opening in the ceiling so the light sits flush with the surface rather than hanging below it. Also called can lights, pot lights, or downlights, each unit points light downward from a housing tucked above the ceiling, leaving only a small trim ring visible. Because nothing projects into the room, recessed lighting gives a clean, uncluttered ceiling and is used to spread even, general light across a space or to wash light down a wall or over a work surface.
In practice
A grid of small round lights set into a kitchen ceiling, a few downlights washing an accent wall, or a row over a hallway. From below you see only flush trim rings; the housing, wiring, and bulb sit hidden in the ceiling cavity, so the light reads as part of the ceiling rather than a fixture on it.
Why it matters
Recessed lighting delivers even, general light without taking up visual space, which keeps a ceiling clean and makes a room feel taller and less cluttered. It is flexible too: aimed straight down it lights a whole room, angled with a gimbal trim it becomes accent light on art or a wall. The trade-off is that it is harder to install and reposition than a surface fixture, so the layout is worth planning before the holes are cut.
How far apart to space recessed lights
A common rule of thumb is to divide the ceiling height by two to get the spacing between lights: an 8-foot ceiling suggests roughly 4 feet apart, a 10-foot ceiling roughly 5 feet. Keep the outer lights about 2 to 3 feet off the walls so you light the room, not just the floor in the middle, and add a light over each work zone such as a sink or countertop. Even spacing matters more than exact numbers; uneven gaps read as dark patches.
Sizes, trims, and types
The two common sizes are 4-inch and 6-inch: 4-inch lights give tighter, more focused pools and suit accent work and smaller rooms, while 6-inch lights spread more light and suit general lighting in larger spaces. Trims change the look and job: baffle trims cut glare for general light, gimbal or eyeball trims tilt to aim light, and canless (wafer) fixtures are thin LED units that skip the bulky housing and are easier to retrofit than traditional cans.