DIY Outdoor Lighting Tips for Beginners
Low-voltage systems make it easy—even if you have no electrical experience
No Electrical Experience Necessary
Since most outdoor lighting is low voltage, it’s safe and easy enough for any DIYer to install. In fact, the only special tool you’ll need is a wire stripper.
Install Underground Wiring After Planting
To prevent accidental cutting of wiring for ground-level fixtures, install wiring after your landscape has been planted. That way you won’t accidentally chop through it with a shovel. Also, don’t install wiring in digging areas like garden beds, and be sure to bury low-voltage wire at least 6 in. below the surface.
How It All Fits Together
A low-voltage system has three parts:
- The transformer plugs into a nearby GFCI-protected outlet and reduces 120-volt current to 12 volts.
- The low-voltage cable carries current between the transformer and the light fixtures.
- The light fixtures get connected to the cable with wire connectors made specifically for outdoor use.
Keep Your Fixtures; Upgrade Your Bulbs
For decades, halogen lights reigned supreme in low-voltage outdoor lighting systems, but LEDs have all but replaced them because they cost less to operate and last much longer. But you don’t have to tear out all your old halogen fixtures to enjoy the benefits of LEDs—retrofit bulbs are available. Just be sure to replace each halogen bulb with equivalent wattage and the same base type.
Expect to pay about four times more for an LED bulb, but they use less energy and you’ll get up to 20 years of life from one compared with only two or three years from a halogen.
Don’t Overlap Pools of Light
The purpose of most deck lighting is ambience, and professional outdoor lighting designers say it’s best not to create overlapping ‘pools’ of light on decks and patios. So avoid mounting fixtures too close together. For decks, choose fixtures that cast a 4- to 5-ft. pool of light. Keep them 30 in. up off the deck’s floor and space them up to 10 ft. apart. Overlapping lights on deck stairs and walkways can be a good thing, however, by providing enough light to help people avoid tripping.
Options for solar landscape and deck lights have exploded at home centers. And there are some reasons to love them: instant installation, no wiring and no increase in your electric bill. Just don’t expect the same kind of light you’d get with 12-volt systems. Solar fixtures typically produce fewer lumens, which means they’re not as bright.
Indirect Lighting Works Great for Patios
Instead of focusing lights directly onto a patio, try lighting objects around it, like boulders and trees. This eliminates glare and creates attractive shadow effects.
Kits for Convenience
You can buy complete ground-level landscape lighting kits at home centers. Kits are convenient and adequate if you only need a few fixtures. But the transformer—sometimes called a power pack—will be too small if you decide to add more fixtures down the road, and style options for fixtures will be much more limited with a kit. For a deck lighting system, plan to buy individual components.
Skip the Quick Connectors
Some landscape lighting kits have preinstalled quick connectors, but they aren’t what the pros use. Cheap connectors buried underground will work for a while, but they can corrode over time and fail. Cut off the factory-installed connectors and make splice connections using gelfilled wire connectors made specifically for outdoor use.
Experiment with Clamp Lights
Before you buy anything, make a sketch of your deck or patio on graph paper (or use a program like Sketch-Up) and plan the location for each of your new light fixtures. To get an idea of the effect a fixture will give, pick up a clamp light—the kind with a metal reflector shade—and a few different types of lightbulbs with different brightnesses. Then, when it starts to get dark, try out the clamp light using different bulbs in a few different spots so you can observe their effect. Mark the most desirable locations on your drawing, and pay particular attention to lighting areas like stairs and transitions to different levels for safety.
You Can Keep Your Old Transformer
Any older low-voltage transformer can be used to power both halogen and LED lights—even if they’re mixed on the same circuit—as long as you have enough wattage to spare in your old transformer. If your transformer isn’t big enough to handle the additional load, add a second transformer or upsize your existing one.
Buy the Right Transformer
A ‘low-voltage’ lighting system starts with a transformer plugged into a GFCI-protected receptacle. The transformer’s job is to convert 120-volt household current to 12 volts before sending it through special outdoor cable to light your fixtures. Just a few years ago, you would have needed a 600- to 1,200-watt transformer to light a yard full of halogen lamps. But because LEDs use fewer watts than their halogen predecessors, smaller transformers—45 to 300 watts—are usually all that’s needed.
So how big should you go? Just do the math! Simply add up the wattage for all the light fixtures you’re planning to install, and use that number to pick the right transformer. Buy one slightly bigger than you need in case you decide to add fixtures in the future.
Run Wire Under Walkways
If you need to run wiring under an existing walkway, try this trick: Dig a small trench on both sides. Next, flatten the end of a piece of rigid metal conduit and use a sledgehammer to drive the conduit, flattened end first, horizontally under the walkway. Then cut off the ends of the conduit with a hacksaw, file off the sharp edges and feed your wire through the conduit. A 10-ft. stick of rigid steel conduit (the thick, heavy-duty stuff) is inexpensive and available at home centers.