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EXPERT LIGHTING ADVICE

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ROI ANALYSIS AND DESIGN SUPPORT

Landscape Lighting

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Landscape Lighting for Commercial Properties: 120V or Low Voltage?

Residential DIY advice dominates this product category, but the design questions on an HOA common area, a hotel entry sequence, or a campus quad are different: system voltage, transformer capacity, and maintainability across hundreds of linear feet of planting beds. The first call is voltage, and the table below frames it the way a property manager or landscape contractor should.

FactorLow Voltage (12V)Line Voltage (120V)
InstallationShallow burial cable; simpler trenching; verify local code for burial depthConduit, junction boxes, and a licensed electrician throughout
Safety in planted areasLow shock risk where irrigation, digging, and mulching happenFull line voltage in the landscape; more protection required
ReconfigurationEasy to move fixtures as plantings matureFixture moves mean conduit work
Fixture selectionWidest range of path, well, and accent fixturesStrongest for high-output floods and large-scale area coverage
Typical fitBeds, walkways, uplighting, most commercial landscape workLong throws, tall facades, and sites already trenched with conduit

Low voltage landscape lighting is the default for most commercial planting areas for the same reasons it dominates residential work: safer cable in dirt that gets disturbed, and flexibility as the landscape grows. Line voltage earns its place where output demands exceed what 12V fixtures deliver economically.

Transformer Sizing: A Worked Example

Size the transformer from the connected load, not from guesswork. Total the fixture wattage on the run: eighteen 4-watt path lights (72W) plus six 6-watt uplights (36W) is a 108-watt connected load. Add roughly 20 percent headroom, which brings the requirement to about 130 watts, and spec the next standard transformer size up, here a 150-watt multi-tap unit. The headroom protects the transformer and leaves room to add a fixture later without re-doing the layout.

Voltage drop is the second half of the sizing exercise. Long home runs lose voltage along the wire, which reads as dim, warm-shifted fixtures at the far end of the run. Counter it by splitting the load across multiple shorter home runs, stepping up to heavier gauge cable on long distances, and using the higher taps on a multi-tap transformer to compensate for the drop the run will see. Transformers with photocell and timer controls automate dusk-to-dawn or dusk-plus-hours operation, the standard operating pattern for hospitality and multifamily sites.

Aiming and Spacing Basics

Path lights are typically laid out 6 to 10 feet on center, a spacing range landscape lighting designers use to produce overlapping pools of light without a runway effect; tighter spacing suits lower-output fixtures and step areas, wider spacing suits brighter fixtures on open walks. For uplighting, place well lights or directional uplights to graze trunks and facades, lighting specimen trees from two sides where viewing angles demand it. Keep aimed fixtures shielded away from walkway sight lines and building windows, since glare complaints are the most common callback on commercial landscape lights.

Garden Lights, Materials, and What Lasts

Commercial sites punish fixtures with irrigation spray, fertilizer, and mower traffic, so material selection is a maintenance decision. Brass and copper fixtures cost more up front and outlast aluminum in corrosive or coastal conditions; powder-coated aluminum and composite garden lights keep budgets in line on protected sites. Whatever the material, specify fixtures with sealed, serviceable lamp compartments so ongoing maintenance does not mean replacement.

Browse the fixture families in this category: path lights, well lights, and landscape flood lights. For taller illuminated pathway markers, see bollard lights, and for building-mounted and area fixtures beyond the planting beds, the full outdoor lighting category.

Frequently Asked Questions

Usually, yes. 12V systems are the standard for planted areas on HOAs, hotels, and campuses because the cable is safer where digging happens and layouts stay flexible. Low voltage landscape lighting also lets crews add or relocate fixtures as plantings mature without trenching or conduit work. Reserve 120V for high-output floods and long-throw applications.

Add up the wattage of every fixture on the run, add about 20 percent headroom, and round up to the next standard transformer size. A 108-watt fixture load lands on a 150-watt transformer. Split large systems across multiple transformers rather than maxing out one.

Plan on 6 to 10 feet on center depending on fixture output and beam spread. The goal is overlapping pools of light along the walk, not evenly spaced bright spots with dark gaps between them. Tighter spacing suits entry walks and steps where footing matters; wider spacing works on long garden paths that only need guidance.

On coastal, heavily irrigated, or high-visibility sites, generally yes, because brass weathers rather than corrodes. On protected inland sites with a defined refresh cycle, quality powder-coated aluminum keeps the budget working harder. The labor to replace a failed fixture often costs more than the fixture itself, which is what tips large properties toward brass.

Most low voltage landscape lighting runs use 12 AWG direct burial cable, stepping up to 10 AWG for long runs or heavier loads to control voltage drop. The farther the fixtures sit from the transformer, the heavier the cable needs to be. Follow the transformer manufacturer's distance and load charts rather than guessing, and split long runs into shorter loops where possible.

Through the transformer. Most commercial grade transformers accept a photocell for dusk to dawn operation, a timer, or both, so grounds crews never touch the system day to day. Astronomic timers track sunset year round without seasonal adjustment. On larger sites, tying the transformer into the building's lighting control system keeps landscape zones on the same schedule as the rest of the exterior.