Why Under-Cabinet Lighting Matters
Overhead lights cast shadows exactly where you chop, measure, and read recipes. Under-cabinet lighting fixes that by putting LEDs inches above the counter, illuminating the work surface directly. You'll notice the difference the first time you dice an onion or check if the chicken is done.
Beyond task lighting, under-cabinet fixtures add ambient glow in the evening. Dimmable LEDs let you dial down to night-light levels without opening the fridge for illumination. It's a small change that changes how the kitchen feels every single day.
Modern LED strips and puck lights draw so little power—often 20 to 40 watts total for a full kitchen—that running them costs pennies per month. They produce almost no heat, so they won't soften butter on the counter or warm up the space in summer.
LED Strip vs Puck Lights: Which Fits Your Layout
LED strip lights mount in a continuous run along the front underside of the cabinet. They deliver even, shadow-free light across the entire counter. Strips are ideal for long, uninterrupted runs and modern kitchens where you want a seamless look. Most strips come in rigid bar housings—easier to install than flexible tape and less prone to visible LED dots.
Puck lights are individual round or square fixtures spaced 12 to 18 inches apart. They create pools of light with subtle gaps between. Pucks work well in kitchens with short cabinet segments, corner cabinets, or when you need to dodge existing trim or corbels. They're also simple to add one at a time if budget or timeline is tight.
Both styles are available in warm white (2700–3000K, matches incandescent bulbs), neutral white (3500–4000K, crisper for task work), and tunable versions that shift color temperature on demand. Warm white is the most popular for residential kitchens—it flatters food and faces.
Hardwired vs Plug-In: The Trade-Offs
Plug-in kits connect to an outlet under the cabinet or inside a nearby base cabinet. Installation is fast: stick or screw the lights in place, run low-voltage wire between fixtures, plug in the power supply. No permit, no electrician required. The downside is visible cords, a transformer brick taking up outlet space, and reliance on a switch or remote rather than your existing wall switch.
Hardwired lighting connects directly to a dedicated circuit or ties into an existing switched circuit. The fixtures mount cleanly with no visible cords. You flip the wall switch—or a new dimmer—and the lights come on. Hardwired systems require a licensed electrician, a permit in most jurisdictions, and careful planning so junction boxes land behind or inside cabinets.
If you're remodeling, go hardwired. It's cleaner, adds to home value, and eliminates the plug-in clutter. If cabinets are already installed and you want lights this weekend, a quality plug-in kit is a reasonable short-term solution. You can always have an electrician convert it later when you're ready to hide the wiring.
Circuit Requirements and Dimming
Most under-cabinet LED systems pull 20 to 60 watts total. That's well within the capacity of a single 15A lighting circuit. If your kitchen already has a switched outlet or a light over the sink on its own circuit, an electrician can often tap that circuit and add the under-cabinet lights to the same switch—or install a separate switch if you want independent control.
If the kitchen lighting is maxed out or you're adding a lot of fixtures during a remodel, a dedicated 15A circuit makes sense. It keeps under-cabinet lighting isolated, prevents nuisance trips, and gives you a clean electrical path for future upgrades like in-cabinet lighting or toe-kick LEDs.
Dimming requires compatible components. Not all LED drivers play nicely with standard household dimmers. Specify a dimmable LED system and pair it with a dimmer rated for LED loads—often labeled 0–10V, ELV, or MLV depending on the driver type. An electrician will match the dimmer to the fixtures so you get smooth, flicker-free control from 100% down to 5% or lower.
Three-way switching—controlling the lights from two locations—is straightforward with standard wall switches. Smart dimmers and wireless remotes are also options if you want app control or voice integration without rewiring.
Installation: What a Licensed Electrician Does
A professional installation starts with layout. The electrician measures cabinet runs, identifies joist direction, and locates studs and existing wiring. Junction boxes are positioned inside cabinets or behind trim where they won't be seen. If the kitchen has a tile or stone backsplash, wire is often fished through the wall cavity or run in surface-mount raceway painted to match.
Fixtures mount to the cabinet underside with screws or adhesive clips. Rigid LED bars typically attach every 12 to 18 inches; puck lights need only a single screw each. Low-voltage wire (usually 18 or 20 AWG) daisy-chains between fixtures. Line-voltage systems (120V) use standard NM cable and require junction boxes at every splice point per NEC rules.
Once wired, the electrician tests each fixture, checks for flicker, confirms dimming range, and verifies that no light bleeds forward past the cabinet face (a sign of poor aiming or missing trim channels). The wall switch or dimmer is installed, the circuit is labeled at the panel, and you flip the switch to see your counters lit evenly from end to end.
Permit and inspection requirements vary by municipality. Most jurisdictions require a permit for hardwired lighting; the electrician pulls it, and the inspector signs off after verifying connections and box fill. It's one more reason to use a licensed contractor—a licensed electrician knows local code and handles the paperwork so you don't have to chase down the building department.
Common Mistakes to Avoid
Mounting too far back. Lights should sit near the front edge of the cabinet, about an inch from the face frame. Mount them in the middle or rear and you'll see your own shadow while working. If cabinets have a lip or trim piece at the front, the electrician may recess the fixture behind that trim to hide the light source while still throwing light forward.
Skipping a trim channel or diffuser. Bare LED strips create hot spots—individual dots of light reflecting in glossy countertops. A diffuser lens or aluminum channel spreads the light evenly and looks cleaner. It costs a few dollars per foot and makes a big difference.
Mixing color temperatures. If you add under-cabinet lights in phases, keep the Kelvin rating consistent. A mix of 2700K and 4000K looks sloppy. Buy extra footage or a spare puck from the same product line so future additions match.
Overloading a circuit. Under-cabinet LEDs don't draw much, but if you're also adding in-cabinet lighting, pantry lights, and recessed cans in the same remodel, calculate the total load. An electrician will size circuits correctly so you're not tripping breakers every time you turn on the coffee maker and the lights together.
Maintenance and Longevity
Quality LED under-cabinet lights are rated for 25,000 to 50,000 hours. At three hours per day, that's 20 to 45 years before brightness drops to 70% of original output (the L70 rating). In practice, you'll remodel the kitchen before the LEDs die.
Clean the diffuser or lens every few months with a damp cloth. Grease and cooking spray build up over time and dim the output. Don't use abrasive cleaners on plastic diffusers—you'll scratch them and create a hazy appearance.
If a fixture stops working, check the connections first. Vibration from cabinet doors or settling can loosen push-in connectors. If an entire run is out, check the breaker and the wall switch. If one puck in a series is dark, it's likely a failed driver or a broken solder joint—replace that fixture.
Hardwired systems are easy to extend. An electrician can add a new cabinet section or a peninsula years later by tapping the existing circuit and matching the fixture style. Keep the product name and model number so future additions match in color and brightness.