How to Install DIY Low-Voltage Landscape Lighting: Step-by-Step Guide
In short: installing 12V landscape lighting means placing fixtures, laying one cable past all of them, joining each fixture to the cable with waterproof connectors, and connecting the cable to a transformer that plugs into an outdoor outlet. Most people finish a kit in a single afternoon. Here is the full process in six steps.
Watch the install first
Prefer to see it done? Watch the QDot install video, then come back for the details below. You can also open the QDot installation guide.
What you need
- Your lighting kit (fixtures, transformer, direct-burial cable, waterproof connectors and the Wire Stripper are all included in QDot kits)
- A weatherproof outdoor outlet within reach of where the transformer will go
- A flat spade or half-moon edger for slitting the soil, and a mallet or hammer for stubborn ground stakes
- A tape measure and a flashlight or your phone for the night test
- Gloves and a pencil and paper for your sketch
Before digging anywhere new, it is typical advice to call 811 (in the US) to have buried utilities marked.
Step 1: Plan your layout
Sketch the yard, mark the outlet, and decide what to light: trees, shrubs, the front of the house and the walkway. Decide where the transformer goes (near the outlet, mounted on a wall or post, out of standing water). Then add up the wattage of your fixtures. Keep the total at or below 80% of the transformer rating: QDot's 75W transformer supports up to 60W, 150W up to 120W and 300W up to 240W. Need help? Read our layout planning guide or ask for the free lighting design.
Step 2: Lay out the fixtures and cable (dry run)
Lay the fixtures on the ground where they will go and unroll the cable past each one without cutting it. Keep the cable route short and avoid crossing driveways and sidewalks where you can. A walk-through now saves redoing work later.
Step 3: Mount the transformer
Mount the transformer on an exterior wall or post near the outlet, following the instructions in the box. Leave it unplugged while you make connections. The transformer has a common terminal (COM) and several voltage taps (12V to 15V), and you will connect the cable ends there.
Step 4: Run the cable
From the transformer, run the cable along the route you chose. You do not need heavy trenching: slit the soil with a spade, lay the cable in and press the soil closed, or tuck it under mulch and along edges. Leave a little slack at each fixture and near the transformer. Each fixture has its own lead of direct-burial wire, and the main cable in QDot kits is UL-listed direct-burial type.
Step 5: Connect each fixture
At each fixture position, use the Wire Stripper to strip the outer jacket of the cable and the ends of the fixture leads. Insert the cable and the fixture leads into the connector, close it, and make sure the connection is firm. QDot X Style 5-Line Wire Connectors are rated IP68 and each connection takes about a minute. Push the fixture's ground stake in firmly, then aim the spotlight or stand up the path light.
Tip for tree uplighting: put the spotlight a few feet from the trunk and aim up at an angle, so the light grazes the bark and fills the canopy. Use a 10W spotlight for tall trees and a 5W for shrubs and small features.
Step 6: Power on, test and finish
Connect the cable ends to the COM terminal and a voltage tap on the transformer, then plug it in. Test at night: check each light, adjust aim, and look for any that look weaker than the rest. After you are happy, bury or cover the cable and set your schedule. With the QDot Smart Switch you can turn lights ON/OFF from your phone, set schedules and control the system remotely from anywhere when your phone has internet. QDot also works with Alexa. Follow the instructions in your kit for pairing.
Troubleshooting
- A light does not come on. Unplug the transformer and re-check the connection at that fixture. Make sure the wire is fully seated in the connector and the jacket was stripped enough.
- None of the lights come on. Check the outlet, the transformer terminals and the schedule or timer setting.
- The last light is weaker than the first. This is typical voltage drop on long runs. Try a higher voltage tap, split the run, or use heavier 12/2 cable.
- Lights flicker. A loose connector is the most common cause. Unplug, re-seat and retest.
Still stuck? The landscape lighting FAQ covers common questions, or email sales@qdotlife.com.
Wondering whether wired lighting is right for you? Read solar vs low-voltage.
FAQ
Do I need an electrician to install low-voltage landscape lighting?
Usually not. A 12V system plugs into a standard outdoor outlet. If you do not have a weatherproof outdoor outlet near where the transformer should go, have a licensed electrician add one.
How long does installation take?
QDot lists about 1–2 hours for the Starter kit, 2–3 hours for Pro and 3–4 hours for Ultimate, with no electrical experience needed. Bigger yards and longer cable runs take more time.
How deep should I bury the cable?
A common approach is a few inches under soil or mulch, and some people go deeper where beds get edged or lawns get aerated. Rules vary by location, so check your local code. QDot kits include UL-listed direct-burial cable.
What if the last light on a run looks weaker than the first?
That is typical voltage drop on a long run. Common fixes are moving the cable to a higher transformer voltage tap, splitting the layout into shorter runs, or using heavier 12/2 cable.
Can I add lights after the first install?
Yes. QDot systems are expandable. Keep the total fixture wattage at or below 80% of your transformer rating, then connect new fixtures along the existing cable.
Ready to pick a kit?
QDot sells three complete DIY kits, each with fixtures, a transformer, direct-burial cable, waterproof connectors and a Wire Stripper: Starter ($299), Pro ($549) and Ultimate ($699). Not sure which fits your yard? Our free lighting design service will suggest a layout: email sales@qdotlife.com with a few photos of your yard and where your outdoor outlet is. New to all this? Start here, browse the landscape lighting FAQ, or see how we stack up in QDot vs VOLT.