LED Downlight Guide — Choose the Right Size, Lumens, and Color Temperature

Room and fixture

Downlights Needed3
Total Lumens2,400 lm
3000K AppearanceSoft White
Best Rooms at 3000KKitchens, dining rooms

A 120 ft² room at 20 fc needs 2,400 lm total, or 3 fixtures at 1000 lm each. At 3000K the light reads as Soft White.

Enter room dimensions and a target level to see fixtures needed, and drag the Kelvin slider to see how color temperature reads at each value.

"LED downlight" is a manufacturing term for any recessed fixture with a built-in LED module rather than a replaceable bulb. Output is labeled in lumens, CRI describes color accuracy, and Kelvin describes warmth — three separate specs worth checking independently before buying.

Terminology

LED Downlight vs. Can Light vs. Wafer Light

Can Light

Describes the metal housing style — a "can" fastened to a joist before drywall goes up. Not a light-source technology.

Wafer Light

The thinnest recessed format, often under an inch deep, with the driver in a remote junction box.

LED Downlight

Describes the light-source technology — a built-in LED module instead of a replaceable bulb, regardless of housing style.

Drivers and efficiency

Dimmable Drivers, IC Ratings, and Energy Efficiency

CRI 90+ Kitchens and bathrooms, where color matters
2700–5000K Typical color temperature range
75–85% Energy saved vs. incandescent
IC-Rated Required near attic insulation

Check a fixture's published dimming compatibility list before pairing it with a dimmer — performance is a property of the driver-dimmer pair, not either part alone. See the installation cost calculator for what a dimmer circuit typically adds to a retrofit.

Frequently asked questions

LED Downlight FAQ

  • What is an LED downlight?

    An LED downlight is a manufacturing term for any recessed fixture with a built-in LED module instead of a replaceable bulb. Output is labeled in lumens rather than watts — the input any recessed light calculator needs to work.

  • LED downlight vs. can light vs. wafer light — what is the difference?

    A can light describes the metal housing style. A wafer light is the thinnest recessed format, often under an inch deep, with the driver in a remote junction box. "LED downlight" describes the light source technology and applies across all housing styles, including can and wafer.

  • What CRI should I look for in an LED downlight?

    Treat 80 as the buying minimum, and specify 90 or higher in kitchens and bathrooms, where judging how done meat is or a foundation shade depends on color accuracy.

  • Are all LED downlights dimmable?

    No — only fixtures specifically labeled dimmable, paired with a dimmer specifically rated LED-compatible. A dimmable LED driver draws only a fraction of the current an incandescent fixture did, and an old dimmer rated for that heavier load will flicker, buzz or refuse to turn off fully.

  • IC-rated vs. non-IC — which do I need?

    IC-rated fixtures are safe to install in direct contact with attic insulation; non-IC fixtures need an 8-inch clearance. Any fixture going into an insulated ceiling — a top floor or a ceiling under an attic — needs to be IC-rated.

  • How much more efficient are LED downlights than incandescent?

    LED downlights typically use 75–85% less energy than incandescent fixtures for a comparable light output, and last many times longer — a meaningful factor in both the energy-efficiency case and the total cost of a retrofit.