Outdoor lighting transforms your yard after dark — illuminating paths for safety, highlighting landscaping, and extending the usable hours of your patio. Low-voltage landscape lighting is a true DIY project that requires no electrical license, no permits, and no risk of dangerous shock.

How to Install Outdoor Landscape Lighting

Low Voltage vs Line Voltage

Most residential landscape lighting uses a low-voltage system: a transformer plugs into a standard outdoor GFCI outlet and steps the voltage down from 120 volts to 12 volts. The 12-volt wiring is safe to handle, can be buried just a few inches deep, and does not require conduit or permits.

Line-voltage (120V) outdoor lighting is used for permanently mounted fixtures like porch lights, floodlights, and post lamps. That work involves your home’s electrical system and should be handled by a licensed electrician unless you have experience with electrical work and pull the appropriate permits.

This guide covers low-voltage systems, which account for the vast majority of DIY landscape lighting projects.

Planning Your Layout

Walk your property at night with a flashlight and mark the spots where you want light. Common placements include:

• Path lights: Every 8 to 10 feet along walkways and driveways
• Uplights: At the base of trees, architectural features, or large shrubs
• Downlights: Mounted in trees or under eaves to cast natural-looking light below
• Accent lights: Highlighting garden beds, water features, or retaining walls
• Deck and step lights: Mounted on risers or posts for safety

Sketch a rough plan showing fixture locations and wire runs. Count the fixtures and add up their wattage to size the transformer.

Sizing the Transformer

Add up the total wattage of all planned fixtures. Choose a transformer rated for at least 10 to 20 percent more than your total load. For example, if your fixtures total 180 watts, choose a 200-watt or larger transformer.

Most LED landscape lights draw 3 to 5 watts each, so a 200-watt transformer can power 40 or more LED fixtures. If you are using older halogen bulbs (20 watts each), you will need a larger transformer or fewer fixtures.

Install the transformer near a GFCI-protected outdoor outlet, at least 12 inches above grade. Most transformers include a timer and/or photocell so the lights turn on automatically at dusk.

Wiring Layout

Low-voltage landscape wire is typically 12-gauge or 14-gauge, two-conductor direct-burial cable. Use 12-gauge for longer runs (over 100 feet) or higher loads to minimize voltage drop.

There are three common wiring layouts:

• Daisy chain: One cable runs from the transformer to each fixture in series. Simple but lights at the end of the run may be dimmer due to voltage drop.
• T-method: One main cable runs from the transformer, then splits into two branches going in opposite directions. Balances the load and reduces voltage drop.
• Hub method: Multiple shorter cables run from the transformer to different zones. Best for large properties or mixed fixture types.

For most residential projects, the T-method gives the best balance of simplicity and performance.

Installation Steps

Place the Fixtures

Set each fixture in its planned location. Step back and look at the spacing and angles. Adjust before you commit to digging.

Run the Cable

Lay the cable on the ground along the planned route. Use a flat spade to cut a narrow slit 3 to 6 inches deep in the soil. Tuck the cable into the slit and press the turf back into place. No trenching required — just a clean cut.

Leave a few extra feet of cable at each fixture location to allow for adjustment.

Connect Fixtures

Most low-voltage fixtures use snap connectors or pierce-point connectors that clamp onto the cable without stripping. Push the connector halves together until they click, enclosing the cable and making the electrical connection.

Some higher-end fixtures use waterproof wire nuts or gel-filled connectors for a more reliable connection. These take a bit more time but resist corrosion better.

Connect to Transformer

Strip the cable ends and connect them to the transformer’s output terminals. Most transformers have multiple voltage taps (12V, 13V, 14V, 15V). Start at 12V. If fixtures at the far end of the run are noticeably dim, move the cable to a higher tap to compensate for voltage drop.

Test

Turn the system on and check every fixture. Walk the entire layout at night and adjust fixture positions and angles. Most fixtures have adjustable stakes or swivel mounts.

LED vs Halogen

LED fixtures have largely replaced halogen in landscape lighting. LEDs use 75 to 80 percent less energy, last 25,000 to 50,000 hours versus 2,000 to 5,000 for halogen, and produce less heat. The upfront cost is slightly higher, but the energy savings and reduced maintenance make LEDs the clear winner for new installations.

If you are upgrading an existing halogen system, you can often swap in LED bulbs without changing the fixtures or transformer.

Maintenance

Check fixtures each spring. Clear any mulch, leaves, or soil that has buried the light output. Realign any fixtures that have been bumped or shifted by frost heave.

Clean lenses with a damp cloth. Replace any corroded connectors — moisture intrusion is the most common failure point in low-voltage systems.

Outdoor lighting is a project that pays off every single evening. Start small with a few path lights and expand the system as you see what works in your yard.