Planning a Low-Voltage Lighting System
A durable landscape lighting system comes down to picking the right fixtures, sizing the transformer correctly, and protecting every connection from moisture.
Low-Voltage vs. Line-Voltage Landscape Lighting
Nearly all landscape lighting runs on low voltage, and for good reason. A low-voltage system runs on 12 volts through a transformer, which makes it safe to handle, simple to bury shallow, and easy to expand later without an electrician for every added fixture. A line-voltage system uses full 120 volts and needs conduit, a permit, and a licensed installer for the run. For garden and path lighting, 12-volt is the standard choice, safer to work with and cheaper to operate over a season.
Types of Landscape Fixtures
Each fixture type lights a different feature of the landscape. A path light spreads a soft pool of light along walkways and garden beds at a low level. A spotlight or directional fixture aims a concentrated beam up at trees, signage, or a building facade. A well or in-ground light sits flush in the ground to uplight from below without a visible fixture. A step or hardscape light tucks into stairs, retaining walls, and other masonry to mark edges at night. Match the fixture to the surface or feature it needs to light rather than defaulting to one type across the whole property.
Sizing a Transformer for the System
Add up the wattage of every fixture that will run on the transformer, then leave roughly 20 percent of spare capacity for fixtures added later, rather than sizing to the exact current load. A multi-tap transformer helps offset voltage drop on longer runs by feeding a slightly higher voltage to fixtures further from the source. Confirm the transformer itself is rated for outdoor, wet-location use before mounting it outside. Lumera's transformers collection covers the sizing options for systems of different scale.
Voltage Drop and How to Prevent It
Voltage drop is light loss over distance. As current travels down a long wire run, voltage falls off, so fixtures at the far end of a run read noticeably dimmer than ones close to the transformer. Thicker gauge wire, shorter individual runs, and a multi-tap transformer all help offset the effect. A hub or loop layout, where runs radiate from a central point rather than daisy-chaining end to end, tends to give every fixture more even voltage than one long single run.
Wet Locations and Splice Protection
Landscape fixtures are built for wet locations as a baseline, sealed against rain, sprinklers, and buried moisture. Well and in-ground lights carry a higher rating still, since they sit directly in soil that can hold standing water. In practice, the fixture itself is rarely where a system fails. Waterproof wire connectors at every splice matter just as much, since an unprotected splice underground is the most common point of failure in an otherwise well-built system.
Landscape vs. Other Outdoor Fixtures
Landscape lighting covers ground-level and up-lighting needs, paths, beds, trees, and hardscape features. For light mounted directly on the building itself, entries, garages, and exterior walls, outdoor wall lights are the better fit.
For flush, ground-set uplighting specifically, Lumera's LED well and in-ground lights collection is worth a closer look on its own, since it's a large enough fixture type to browse separately from the rest of this collection.
Rounding out a full run, connectors, stakes, and mounting hardware are in Lumera's landscape lighting accessories collection.
Where a broader lighting plan calls for it, wide-beam flood lights cover larger area lighting that individual path and spot fixtures aren't built for.
Landscape Lighting Questions, Answered
What's the difference between low-voltage and line-voltage landscape lighting?
Low-voltage runs on 12 volts through a transformer, making it safe to handle and simple to expand. Line-voltage uses full 120 volts and requires conduit, a permit, and a licensed electrician for installation. Low-voltage is the standard for garden and path lighting.
How do I size a transformer for my system?
Total the wattage of every fixture on the run, then choose a transformer rated above that load with about 20 percent spare capacity for future additions. A multi-tap transformer helps offset voltage drop on longer runs by supplying slightly higher voltage to distant fixtures.
What is voltage drop and how do I prevent it?
Voltage drop is the loss of voltage as current travels down a long wire run, which makes fixtures at the end of the run appear dimmer. Thicker wire gauge, shorter runs, a multi-tap transformer, and a hub or loop layout instead of one long daisy chain all help reduce the effect.
Are landscape lights safe in wet ground and weather?
Yes, when the fixture is rated for it, which is standard for landscape lighting. Well and in-ground lights carry an even higher rating since they sit in soil that holds standing water. The more common failure point is an unprotected wire splice, so use waterproof connectors at every connection underground.
What's the difference between a path light and a well light?
A path light sits above ground on a stake and spreads a visible pool of light along a walkway. A well light installs flush in the ground so the fixture itself is hidden, aiming light upward to highlight a tree, wall, or architectural feature from below.
Almost all landscape lighting is low-voltage, and for good reason. A low-voltage system runs on 12 volts through a transformer, making it safe to handle, easy to bury shallow, and simple to expand. A line-voltage system uses full 120 volts and needs conduit, permits, and a licensed install. For gardens and paths, 12-volt is the standard — safer, cheaper to run, and flexible.
What types of landscape lights are there?
Each fixture lights a different feature. A path light spreads a soft pool along walkways and beds. A spotlight or directional light aims a beam at trees, signs, and facades. A well or in-ground light hides flush in the earth to uplight from below. A step and hardscape light tucks into stairs and walls. Match the fixture to the surface you want lit.
How do I size a landscape lighting transformer?
Add up the fixture wattage, then leave headroom. Total the watts of every fixture on the run, and pick a transformer rated above that load with about 20% spare capacity for future additions. A multi-tap transformer offsets voltage drop on long runs by feeding a higher voltage to distant fixtures. Confirm the transformer is rated for outdoor, wet-location use.
What is voltage drop and how do I prevent it?
Voltage drop is light loss over distance. As current travels down a long wire run, voltage falls, so fixtures at the end look dimmer than those near the transformer. Prevent it by using thicker gauge wire, shorter runs, or a multi-tap transformer. A common fix is to run a hub or loop layout so each fixture sees similar voltage.
Are landscape lights safe in wet ground and weather?
Yes, when rated for it. A landscape fixture is built for wet locations, sealed against rain, sprinklers, and buried moisture. Well and in-ground lights carry a higher IP rating since they sit in standing water and soil. Use waterproof wire connectors at every splice — the connection, not the fixture, is where most outdoor systems fail.
Building out a full system? The transformers that power these runs are in Landscape Transformers, and for uplighting flush with the ground, the dedicated fixtures are in LED Well & In-Ground Lights.
