How to Choose LED Recessed Lighting and Downlights
Recessed lighting spans several housing types, aperture sizes, and location ratings, so matching the right option to your ceiling is the first step. Here is how to narrow the choice down.
Can vs. Canless Recessed Lighting
A can system uses a separate housing, trim, and bulb, which means replaceable parts and more room above the ceiling for wiring. A canless unit integrates the LED, driver, and trim into one sealed fixture under an inch thick that mounts through the ceiling with no separate housing, which installs faster and seals the ceiling against attic air leaks. Lumera's recessed housings collection covers the can side of that choice for jobs where replaceable components matter more than install speed.
Replacing an old incandescent or CFL can without touching the wiring is its own category. A retrofit downlight threads into the existing socket with a screw-base adapter and clips into the housing already in the ceiling, converting it to LED in a few minutes. Lumera's retrofit and canless downlights collection covers both that retrofit path and standalone canless fixtures for new openings.
New Construction vs. Remodel Housings
Housing type depends on ceiling access. A new-construction housing mounts to the joists before drywall goes up, installed from above the ceiling during framing. Lumera's new-construction downlights collection covers that framing-stage option.
A remodel housing installs through a cut hole in finished drywall and clips to it with spring tabs, so it works without any attic access. Both housing types accept the same trims once installed, and Lumera's recessed trims collection covers the finish piece that goes on top regardless of which housing is underneath.
Choosing an Aperture Size
Aperture size sets both light coverage and how the fixture reads in the ceiling. Two and three inch apertures suit accent lighting and trim-sensitive ceilings where a large opening would look out of place. Four inch fixtures work well for task and accent zones like hallways, closets, and kitchen counters. Five and six inch fixtures cover general ambient light in living rooms, bedrooms, and larger commercial spaces where broader, more even coverage matters more than a discreet opening.
IC Rating and Fire-Rated Ceilings
IC stands for insulation contact. An IC-rated fixture is built to sit directly against thermal insulation without a fire risk, since it limits its own surface temperature. A non-IC fixture needs a 3 inch clearance from any insulation around it, which matters in an insulated attic or ceiling cavity. Where a ceiling also has to maintain a fire-rated separation between floors, standard IC-rated housings aren't enough on their own. Lumera's fire-rated housings collection covers fixtures built to preserve that rating.
Spacing and Layout
A workable starting point for spacing is dividing the ceiling height by two, so an 8-foot ceiling spaces fixtures roughly 4 feet apart. Keep fixtures 2 to 3 feet in from the walls rather than running them edge to edge. A typical 12 by 12 foot room usually needs four to six 4 or 6 inch downlights to light evenly, though the exact count depends on the room's layout and whether the lights are doing ambient or task work.
Wet, Damp, and Dry Location Ratings
Location listing controls where a fixture is allowed to go. A wet-location-rated downlight with a sealed lens is built for direct exposure over a shower, tub, or an exterior soffit. A damp-location fixture suits a covered porch or a bathroom outside the direct spray zone. A standard dry-location fixture belongs indoors, away from moisture entirely. Check the rating on the listing before installing anywhere steam, rain, or standing water could reach the fixture.
Recessed Lighting FAQs
What's the difference between can and canless recessed lighting?
A can system uses a separate housing, trim, and bulb, with more room above the ceiling and replaceable parts. A canless unit integrates the LED, driver, and trim into one thin, sealed fixture that mounts through the ceiling with no separate housing, which installs faster and seals better against air leaks.
Do I need new-construction or remodel housing?
New-construction housing mounts to the joists before drywall goes up and is installed from above during framing. Remodel housing installs through a cut hole in finished drywall with spring tabs, so it needs no attic access. Use new-construction for a job that's still framed open, and remodel for an existing finished ceiling.
What size recessed light do I need, 4 inch or 6 inch?
Four inch fixtures suit task and accent zones like hallways, closets, and counters. Six inch fixtures cover general ambient light better in living rooms and larger spaces. Two and three inch apertures are for accent lighting on trim-sensitive ceilings where a large opening would stand out.
What does IC-rated mean?
IC stands for insulation contact. An IC-rated fixture can sit directly against thermal insulation without a fire risk, since it limits its own surface temperature. A non-IC fixture needs a 3 inch clearance from insulation, which matters in any insulated attic or ceiling cavity.
Can recessed lights be installed in a shower or wet location?
Only if the fixture is rated for it. A wet-location-rated downlight with a sealed lens is built for direct exposure over a shower, tub, or exterior soffit. A damp-location fixture suits a covered porch or bathroom outside the direct spray zone, and a standard dry-location fixture should stay indoors away from moisture.
