LED Recessed Light Retrofit Guide: Convert Can Lights to LED

Millions of homes have existing recessed can lights with incandescent or CFL bulbs that are inefficient, run hot, and produce poor light quality. LED retrofit kits replace the entire trim, bulb, and sometimes driver in a single, easy-to-install unit — no electrician required in most cases. This guide explains how to choose the right kit and install it correctly.

Why Retrofit Instead of Just Replacing the Bulb?

You can replace an incandescent PAR bulb in a recessed can with an LED PAR bulb. For many situations, this works fine. But a dedicated retrofit kit offers significant advantages:

Better light quality: Retrofit kits use purpose-built LED arrays with higher CRI (color rendering index) and better optical design than a replacement bulb trying to mimic an incandescent.

Better efficiency: Purpose-built drivers in retrofit kits extract more lumens per watt than LED bulbs constrained to a PAR form factor.

Sealing the ceiling penetration: Many retrofit kits create an airtight seal between the fixture and ceiling — stopping conditioned air loss that makes standard can lights notoriously leaky.

Better aesthetics: The flat, flush profile of a retrofit kit looks more contemporary than a PAR bulb in an old cone baffle.

Heat management: LED retrofit kits are designed to dissipate heat properly in the can housing. PAR LED bulbs in enclosed cans can overheat and fail prematurely.

Types of LED Retrofit Kits

Drop-In Retrofit (Bulb Replacement with Better Trim)

The simplest option: a combination of an LED module and trim that replaces the existing trim and screws into the existing socket. The bulb screws into the medium-base socket; the trim clips or snaps onto the can’s trim clips.

Pros: Easiest installation — replace the old bulb and trim simultaneously; uses existing socket Cons: Limited by socket wattage rating; may not seal the ceiling penetration; limited optical performance compared to wired kits

Wired Retrofit Module

A self-contained LED module with its own driver that connects via wire connectors to the existing junction box wiring. The trim attaches to the can opening. No bulb socket is used — the module bypasses it entirely.

Pros: Better efficiency, better optical control, can create an airtight seal, longer life (no socket to fail) Cons: Requires disconnecting the existing wiring — technically more involved than a bulb swap

Integrated Retrofit Can (Full Replacement)

A complete replacement that removes the old can and its trim and replaces it with a modern, integrated LED unit. Common in remodels where the old housings are non-IC-rated or in poor condition.

Pros: Best performance, starts fresh with modern IC/AT-rated housing Cons: More work, may require patching around the opening if sizes don’t match

Choosing the Right Retrofit Kit

Size Match

Retrofit kits are sized to fit specific can opening diameters — typically 4-inch, 5-inch, or 6-inch. Measure the diameter of the existing can’s opening (the circular hole in the ceiling), not the can’s body diameter. Most older homes have 5-inch or 6-inch cans.

Many retrofit kits are “5/6 inch” universal fit, accommodating both sizes.

Wattage and Lumens

Replace incandescent bulbs based on lumen output, not wattage:

Incandescent Bulb	Target Lumens	LED Retrofit Wattage
60W PAR20/PAR30	600–800 lm	8–12W
65W PAR30/BR30	650–800 lm	9–12W
75W PAR38	900–1,100 lm	12–15W
100W PAR38	1,300–1,500 lm	16–20W

For general room illumination from 6” cans, target 650–850 lumens per fixture. For high-ceilinged spaces or when fewer fixtures serve a large area, choose 900–1,100 lumen kits.

Color Temperature (CCT)

Color temperature is measured in Kelvin (K) and determines the “warmth” of the light:

Color Temperature	Appearance	Best For
2700K	Warm white, similar to incandescent	Living rooms, bedrooms, dining rooms
3000K	Warm white, slightly brighter	General purpose, kitchens, bathrooms
3500K	Neutral white	Offices, retail, bathrooms
4000K	Cool white	Task lighting, garages, workshops
5000K+	Daylight	Garages, outdoor, task areas

For most living spaces: 2700K or 3000K produces a comfortable, residential feel. Mixing color temperatures (3000K in the kitchen, 2700K in the adjacent dining room) creates a jarring visual experience — be consistent within connected spaces.

CRI (Color Rendering Index)

CRI measures how accurately a light source renders colors compared to natural daylight (CRI 100). Higher CRI means colors look more natural and accurate.

CRI 80–84: Acceptable for most residential general lighting
CRI 90–94: Good for kitchens, bathrooms, closets, anywhere accurate color matters
CRI 95+: Excellent — look for “High CRI” or “90+ CRI” labeling for critical color applications

LED retrofit kits with 90+ CRI are now widely available at reasonable prices. Whenever possible, choose 90 CRI or higher.

Dimming

Most LED retrofit kits are dimmable — but not all dimmers work well with all LEDs. Common problems with incompatible dimmer/LED combinations:

Flickering at low dim levels
Buzzing (from the dimmer or fixture)
Minimum brightness “pop-on” where dimming doesn’t go as low as expected
Early LED driver failure from incompatible dimmer waveforms

Solution: Use Lutron or Leviton dimmers specifically listed for LED compatibility. The Lutron Caseta series and Lutron DVCL-153PH are the most reliable dimmers for LED retrofit applications.

Always check the retrofit kit manufacturer’s compatible dimmer list — most brands publish this on their website.

IC and Airtight Rating

If the existing can is in an insulated ceiling (attic above, or insulation in floor/ceiling assembly), choose an IC-rated retrofit kit. Many retrofit kits are designed to create an airtight seal between the kit and ceiling drywall, which is especially valuable for reducing conditioned air loss.

Recommended LED Retrofit Kits

Halo HLB6099FS1EMWR (6-inch)

The Halo Hlumen series is the most widely installed LED retrofit kit by professional electricians. The 6-inch model provides 650 lumens, 90 CRI, dimmable, color-selectable (2700K/3000K/3500K/4000K/5000K selectable on the fixture), IC rated, and airtight. The color select feature eliminates the need to choose CCT at purchase — you can adjust after installation.

Price: $20–$28 per fixture

Philips 6-inch LED Retrofit Downlight

Philips’ retrofit kit is competitively priced and widely available at home improvement stores. At around $15–$20, it provides 650 lumens, 2700K or 3000K options, and IC-rated installation.

Nora Lighting NE-612LED (Premium)

For higher CRI applications (93 CRI), Nora Lighting’s retrofit kits are worth the premium. Better color rendering makes a noticeable difference in kitchens, bathrooms, and closets.

Price: $25–$35 per fixture

Sunco 4-inch LED Retrofit Downlight

For 4-inch cans in bathrooms and kitchens, Sunco’s offering provides good lumen output at an economical price point — often sold in 6 or 12 packs for better per-unit cost.

Price: $12–$18 per fixture

Commercial Electric Retrofit Kits (Home Depot)

The Commercial Electric brand (Home Depot’s house brand for lighting) offers competitive pricing on retrofit kits with IC rating, color select options, and generally reliable performance. A good choice for large projects where per-fixture cost matters.

Step-by-Step: Wired Retrofit Installation

What You’ll Need

LED retrofit kit (confirm size and IC/AT rating)
Non-contact voltage tester
Flathead screwdriver
Wire connectors (if not included)
Ladder

Step 1: Turn Off the Circuit

Turn off the circuit breaker for the recessed light you’re converting. Verify the light is off, then verify with a non-contact voltage tester at the fixture that the circuit is dead.

Step 2: Remove the Old Trim and Bulb

Remove the existing trim by pulling it down and unhooking the spring clips from the housing. Set aside the trim and remove the bulb.

Step 3: Access the Junction Box

Reach into the can housing and locate the junction box. It may be a covered metal box inside the housing or the housing itself may serve as the junction box. Open the cover or access point.

Disconnect the existing wiring by unscrewing wire nuts and separating the conductors. Note which colors connect to which (typically black to black, white to white, bare/green to bare/green).

Step 4: Connect the Retrofit Kit

Follow the kit’s instructions — typically:

Black (hot) → retrofit kit lead (often labeled LINE or L)
White (neutral) → retrofit kit neutral lead
Bare/green (ground) → retrofit kit ground lead

Use wire nuts or push-in connectors. Verify connections are tight.

Step 5: Seat the Fixture

Fold the wires into the junction box and replace the cover. Position the retrofit kit in the ceiling opening and press it into place. The spring clips or rotating mechanism grips the back of the drywall and holds the fixture flush with the ceiling.

Step 6: Restore Power and Test

Restore the circuit breaker. The fixture should illuminate. If you have a dimmer, test the full dimming range — verify no flickering at low levels.

Dimmer Upgrade

If you have existing dimmers and are converting to LED, test for compatibility before assuming existing dimmers will work. Many older incandescent or CFL dimmers don’t work correctly with LEDs.

How to test: Install one LED retrofit kit and test with the existing dimmer. If there’s no flickering across the full range, the dimmer is likely compatible. If there’s flickering or buzzing, upgrade the dimmer.

Recommended LED dimmers:

Lutron DVCL-153PH (~$20, 150W LED load): The most reliable choice for most residential applications
Lutron Caseta PD-6WCL (~$55, smart dimmer): Wi-Fi enabled, no hub required, works with Alexa/Google
Leviton DSL06 (~$18, 600W LED load): Good for large fixture counts on one circuit

Energy Savings Calculation

Converting existing incandescent cans to LED saves significant energy:

Before (65W incandescent × 8 fixtures): 520W per hour of operation After (9W LED × 8 fixtures): 72W per hour Savings: 448W per hour, or 4.48 kWh per 10 hours of use

At $0.15/kWh, 4 hours of daily use saves approximately $98/year for 8 fixtures. With LED kit costs around $20 per fixture ($160 total), payback occurs in less than 2 years.

Over the 25,000–50,000 hour rated life of a quality LED retrofit kit, the total savings are substantial — and the lighting quality improvement is immediate.

Converting recessed can lights to LED is one of the highest-return electrical projects available to homeowners. The installation takes about 10 minutes per fixture, the energy savings begin immediately, and the quality of light improves significantly. It’s a weekend project with payback measured in months, not years.