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Low-Voltage Outdoor Lighting

Installing low-voltage outdoor lighting is a big-impact DIY project. And since it's low voltage, it's safe to use and install, even for beginners. Outdoor lighting can be used to illuminate paths, steps and dark zones, plus it can add artfully dramatic emphasis to your yard's best features.

By the DIY experts of The Family Handyman Magazine

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    An average layout will take a day or two. If you have a lot of trenching to do, or need to install a GFCI electrical line, the job could pour over into the next weekend.

Overview

Low-voltage outdoor lights provide a pleasant alternative to glaring floodlights. They can be strategically positioned to accent the plants and features you want to highlight. They can be used for safety—to illuminate paths, steps and dark zones. When artfully placed, they can be as beautiful and natural looking as the landscape itself. And since they're low voltage (you can literally add wires and lights to the system while it’s operating), they're safe to use and install. Here we'll show you the special tips and tricks the pros use to install them.

Selecting the right design and components

Walk into any home center or garden center this spring and you’re guaranteed to run into a towering display of low-voltage lighting. You’ll find $69 prepackaged sets and $100 individual lights; plastic fixtures and metal ones; lights you can shine down from trees and up from ponds. The bottom line is, you’ll get what you pay for. We decided to pay about $90 apiece for metal “architectural grade,” low-voltage halogen lights. The halogen bulbs cast a whiter, more focused beam than standard lights—almost like natural sunlight. And the bulbs last longer, some up to 10,000 hours. The metal construction of the fixtures means greater longevity for them too, and we loved the natural burnished look.

As you design and shop for your lighting system, keep in mind:

  • Buy a larger transformer than you’ll initially need so you can add lights later as your landscape (and imagination) expands. If you’ll be installing 400 watts of lights, buy a 600-watt transformer.
  • Avoid over lighting. Outdoor lights look best as accents, broadcasting pools of light. Flooding sitting or planting areas with “stadium lighting” can make them look washed out.
  • When lighting a path, decide whether you want to light only the path or both the path and the features around it. As a rule, the broader the field you want to light, the higher the light pole you’ll need. Path lights with a 20-watt halogen bulb at a 24-in. height should be spaced every 10 ft.
  • Consider seasonal factors. Install lights where they won’t be easily damaged by plows or shovels. And bear in mind that some plants, like hydrangea bushes, sumac and dogwoods with colorful stems, look cool lit up, even when they’re leafless.
Caution!

For safety's sake, call 811 to have your utility companies mark the location of underground wires and pipes before you dig. The service is usually free—and you’ll avoid dangerous and costly surprises.

Install the lighting components

Pro tips for better design, layout and installation Take the time to install your lights correctly and they’ll last longer, cast more light where you want it and require less maintenance. Get a first-class installation using these tips:

  • If your lights come with press-on fittings—the type that bite through the insulation and into the wire to make their connection—cut them off and use the wire connectors shown in Photo 4. Your connections will be more solid and longer lasting.
  • The farther a light is from the transformer (and the more lights installed between it and the transformer), the less light it will put out. Avoid this “voltage drop” by creating a tee (Fig. A) and running two short lines rather than one long one. A good rule of thumb is to put no more than 100 watts of lighting on one line. If you want to put ten 20-watt lights on a circuit, make a tee connection with five lights on one line and five on the other. You can also minimize voltage drop by using a thicker gauge wire.
  • Always leave a little extra wire as you hook up the lights. This will give you the freedom to move a light after you’ve hooked it up for testing or after you’ve installed it.
  • Burying the wires should be your last step. Lay everything out, hook up your lights, test your voltage, and look at your results at night before burying the lines.
  • Purchase a transformer with a built-in photocell and timer. Orient the photocell with some western (sunset) orientation so it doesn’t turn lights on too early.

Special Lights for Special Effects

A moon light should be installed 15 to 30 ft. high and have one or more branches between it and the ground to simulate moon shadows. Provide at least 24 in. between the light and branches to prevent "hot spots." Make a 4 x 5-in. base from treated lumber or cedar, mount the light base to it and insert your wire connectors into the hollow light base. Attach the assembly to the tree with galvanized or stainless steel screws. Use plastic wire clips with stainless steel nails to secure the wire to the tree every 3 ft.

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Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

    • Level
    • Extension ladder
    • Garden rake
    • Voltage tester
    • Posthole digger
    • Safety glasses
    • Wire stripper/cutter
    • Wrench set

You'll also need a volt meter, a garden spade and aluminum tent stakes.

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

    • Transformer
    • Lights
    • #10 gauge outdoor wire
    • #12 gauge outdoor wire
    • For each ground light: 1-1/2-in. PVC coupler with ½-in. tee for wire opening
    • 1-1/2 in. x 12-in. PVC pipe, 1-1/2-in. PVC cap with ½-in. female thread
    • ½-in. copper pipe
    • Two ½-in. sweat-to thread copper adapters
    • One box of weatherproof wire connectors

Comments from DIY Community Members

Share what's on your mind and see what other DIYers are thinking about.

1 - 6 of 6 comments
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May 03, 11:26 PM [GMT -5]

I have a silly question but have have bad eyes as well lol.
When connecting the waterproof connectors, how did you splice the main wire from the transformer at every light?
Thanks

December 17, 7:27 AM [GMT -5]

I installed three landscape lighting systems with three transformers for my place about 12 years ago. The advice given concerning use of wire nuts instead of the cheap insulation penetrating connectors supplied with most fixtures is sound. I have gone a step further by soldering connections that have failed instead of using wire nut connectors. The biggest issue I have had is corroded bulb bases in the fixtures themselves. I have addressed that by using a bit of dielectric grease on the prongs of bulbs before installing them as replacements for burned out lamps in my fixtures. I have rewired some of my fixtures with new bulb sockets as they get on with age and corrode instead of buying new replacement fixtures. I have also begun replacement of halogen lamps with LED lamps to reduce electric power consumption.

November 15, 9:46 PM [GMT -5]

Well you were right. Get a bigger transformer than you think you need! I finally broke down and got a 600w to replace 150w. Now I have seen the LIGHT! This was the BEST, helpful information out there. I need just one more light to the porch but now have the power to do it. LOVE my system
Thanks!

November 03, 7:25 PM [GMT -5]

I had bought a set of low voltage tulip light to light a path to my studio. Using the directions here I was able to put them in plus a light for my deck and have them up and running the first try. Great instructions and so much excellent help! I would not have tried it without these instructions. THANK YOU!
Bonnie

May 25, 3:17 PM [GMT -5]

My neighbors had lights installed in their yard last year. I think I'll add some of my own (myself!) and show them up!

May 10, 5:07 AM [GMT -5]

stunning garden landscape that may be enjoyed at night by the inventive

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