Install Hardwired Under-Cabinet LED Lighting Without Glare
Counters are where you actually work in a kitchen, and the ceiling light puts your shadow right on top of them. Hardwired LED bars fix that permanently for a couple hundred dollars and one Saturday.
Under-cabinet lighting makes a kitchen feel remodeled without touching a cabinet. It puts light where knives and cutting boards are, makes a backsplash glow at night, and done hardwired leaves no cords, no plugs, and no puck lights quitting one at a time. The design mistakes are predictable: fixtures at the back of the cabinet that glare off the counter, mismatched color temperatures, and a driver stuffed where it cooks itself. The wiring is simple low-voltage work with one 120-volt connection, and that connection is the part to respect.
Low-voltage design in three numbers
Wattage: add every fixture’s rating and choose a driver at least 20 percent higher, so 15 feet of tape at 3 watts per foot wants a 60-watt driver. Color temperature: 2700K to 3000K suits most kitchens; pick one and use it everywhere. CRI: 90 or higher so food and finishes look right. Buy fixtures, driver, and dimmer as a compatible set, because a dimmer that flickers a driver is the most common complaint we hear.
Map the wiring path and the driver home
Drivers need air and access: above the uppers behind crown, on a shelf inside a cabinet against the back wall, or in the sink base. From there, low-voltage wire reaches each cabinet run through a 3/8-inch hole in the cabinet bottom, up the gap behind the cabinet, and across the tops. The dimmer needs a 120-volt feed from an existing switch box or a nearby circuit.
Kill power and run the switch leg
Turn off the breaker and verify with a non-contact tester at the box you are tapping. Fish 14-gauge NM cable to a new single-gang box for the dimmer and from the dimmer to the driver, keeping cable in the wall or above cabinets where nothing can pinch it, with 8 inches of slack at every box. If your only source is a counter receptacle circuit, ask your inspector; many codes keep those 20-amp circuits free of lighting.
Mount fixtures at the front third
Hold a bar under the cabinet and look from standing height and from a barstool. At the back, it lights the wall and reflects off glossy counters into your eyes. About 2 inches behind the face frame, it lights the work surface and the cabinet lip hides it. Drill pass-through holes at the back corners, clip the bars or channel to the underside, and keep runs continuous across a bank, cutting tape only at marked points.
Make the low-voltage connections
Run 18-gauge in-wall-rated wire from each fixture to the driver, staying under the maker’s maximum length so the far end does not dim. Label each pair. At the driver, all positives to positive, all negatives to negative. Strip only what you need; a stray strand touching aluminum channel shorts the run. Tuck wire into the recess behind the cabinets or a paintable stick-on channel.
Wire the driver and dimmer, then test
Connect the switch leg to the driver’s 120-volt input inside its junction compartment with a cable clamp at the entry, ground included. Wire the dimmer per its diagram, restore power, and sweep the full range watching for low-end flicker; most dimmers have a trim adjustment for exactly that. Add a light-rail molding so the fixture disappears from a seated view.
Always confirm power is off with a tester before opening a box; kitchens often carry more than one circuit in one box. Drivers are heat sources, so never bury one in insulation or seal it in a closed cabinet with no airflow. Most jurisdictions require a permit for a new switch leg; the homeowner permit is cheap and the inspection protects your insurance.
Light the counter, not the wall. Two inches forward changes everything.
A decade of light
Quality LED bars are rated 50,000 hours, about 25 years of kitchen use; the driver fails first, usually around year ten, which is why you gave it an accessible home. Wipe fixtures with a dry cloth twice a year. If one run dims or flickers while the rest stay steady, check its connection at the driver before blaming the fixture.
Keep the momentum going
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