Landscape Lighting Maintenance Guide: Annual Service Checklist for Installers
Summary: Service a low voltage landscape lighting system once a year at minimum, twice on properties with mature plantings or irrigation running through the beds. A full visit runs in order: readings first — load at the transformer, then voltage at the first, middle, and last fixture on every run — followed by connections, lenses and lamps, and a night walk to re-aim. Most of what you find traces back to splices that were never sealed and fixtures the landscape has grown over.
Every system starts moving the day you leave the site. Fixtures sit in wet soil, under irrigation, in beds that get top-dressed each spring, next to crews running edgers and aerators. Stakes heave, lenses cloud, splices corrode, and mulch swallows path lights.
None of that is a reflection on the install. It’s the environment the work lives in, which is why servicing a system is a job worth scheduling and billing rather than something you absorb between installs.
This guide covers how often a system needs servicing, what a full visit actually includes, what fails and why, and how to structure the work so it holds up as a recurring line item.
How Often Should Landscape Lighting Be Serviced?
Once a year is the floor. Two visits — early spring and late fall — is what the lighting-only companies run, and it’s the right call on any property with mature plantings, seasonal mulch, or irrigation running through the beds.
Beyond the schedule, put a visit on the calendar after any of these:
- A major storm, especially anything that took the power out and reset a timer
- Irrigation, hardscape, or drainage work anywhere near a run
- New plantings or bed reshaping
Halogen systems need more attention than LED, because lamp replacement is a recurring line item rather than an exception. In landscape service, a 10,000-hour lamp typically gets 18 to 30 months in the field and a 5,000-hour lamp 12 to 24 months — which means a halogen system will drop lamps between annual visits no matter how well it was built. Price accordingly, or move the client to LED. On an LED system the lamps mostly outlast the service agreement, so the visit shifts toward connections, aim, and plant growth.
Landscape Lighting Maintenance Checklist
This is the working checklist for a full service visit. Run it in this order — power and voltage first, because a reading at the transformer tells you where to spend the rest of your time.
Working a visit right now? Jump to the printable field checklist.
| System area | What to check | Common finding |
|---|---|---|
| Transformer | Terminal tightness, corrosion, moisture in the enclosure, vents clear, secure mounting | Loose or corroded lug, cobwebs and insect nests in the housing |
| Fuses and breakers | Fuse continuity, breaker position, any zone dark end to end | Blown fuse on one zone, mistaken for a wiring fault |
| Controls | Timer or astronomic clock accuracy, photocell function, battery backup, app or WiFi connection | Timer never reset after a power outage |
| Load | Measured load against transformer rating | System expanded since install, now running past 80% capacity |
| Voltage | Reading at first, middle, and last fixture on each run | End-of-run fixture under-volted |
| Connections | Every splice you can reach — seal integrity, tightness, corrosion | Pierce-point connectors, untightened wire nuts |
| Wire | Nicks, exposed cable, shallow runs, damage at bed edges | Edger or trencher strike |
| Fixtures | Lens clarity, gasket and O-ring condition, socket corrosion, housing integrity | Clouded lens, oxidized socket contacts |
| Aim and position | Fixture aim, stake depth, plumb, distance from plantings | Frost heave, plants grown into the beam |
| Lamps | Output consistency, color temperature match across the system | Mismatched replacement lamp from a prior repair |
Voltage readings are the part most crews skip
Measuring output at the transformer only tells you the transformer works. What matters is what the fixture at the end of the run is actually seeing — take a reading at the first, middle, and last fixture on every run and write the numbers down.
Those numbers are the whole diagnostic. A run that reads fine at the first fixture and low at the last has a drop problem, not a fixture problem, and swapping lamps won’t fix it. If the readings come back low, work through the voltage drop diagnosis rather than starting with parts.
Record the readings on every visit. Year-over-year numbers on the same run tell you a connection is degrading long before the client calls about a light going out.
Connections are where the callbacks come from
Open and inspect every splice you can get to. The failures repeat:
Pierce-point connectors. The snap-on clips that bite through the jacket. Fast to install, and a guaranteed future failure — moisture gets in, corrosion starts, the connection loosens, the fixture flickers and then dies. Service companies find these constantly on systems they didn’t install. Cut them out and replace them; don’t re-seat them.
Silicone-filled wire nuts that were never tightened. The grease makes them hard to torque down, so they get left loose, and the conductors end up shorting in the bed with the nut sitting somewhere nearby. This is the single most common repair on inherited systems.
Anything sealed with electrical tape. It isn’t a water barrier and it never was.
Replacements go back in as direct-burial-rated splices — grease-filled wire nuts with a proper cap, or gel-filled heat-shrink connectors on runs you don’t want to touch again. If you’re cutting damaged cable out, splice in new direct burial landscape cable rather than whatever’s on the truck.
Lenses and finishes
Cut power before you touch a lens or a socket. Soft cloth, mild soap and water, nothing abrasive — a scratched polycarbonate lens diffuses light permanently, and solvents will haze it.
Irrigation spray leaves mineral deposits that soap won’t lift. Those need a descaler on the glass only, kept off the finish and the gasket.
Brass and copper are the one place to slow down. The patina is the finish doing its job, and polishing it back to bright is undoing what the client paid for. If a client reads the patina as damage, that’s a conversation before the visit, not a decision you make with a rag in your hand.
Aim, stake, and re-set
Landscapes move. Frost heave lifts stakes, soil settles, mulch gets top-dressed over low fixtures, and plants grow into the beam.
Walk the property in daylight to re-plumb stakes, clear mulch and debris off lenses, and pull back growth that’s blocking output. Then come back after dark to re-aim — a fixture aimed correctly at install can be washing a wall or throwing glare into a window three years later once the tree it was lighting has filled in.
When a fixture has to move more than a foot or two to keep working, that’s not a re-aim, it’s a layout change. Re-derive the position from fixture spacing and setback instead of guessing at the new spot, and flag any run where the fixture count has changed enough to matter electrically.
What Actually Fails on a Landscape Lighting System
Most of what you’ll find on a service call was built into the system on install day.
Bad connections, by a wide margin. Unsealed or under-tightened splices account for more repair work than every other cause combined. On a 20-fixture system there are at least 40 connections, and each one is a potential callback.
Fixture socket oxidation. A white-green powdery deposit on the lamp contacts, usually from a failed gasket or a fixture without a proper seal. Clean the contacts and replace the O-ring; if the housing itself is compromised, replace the fixture.
Buried and blocked fixtures. Spring mulch top-dressing swallows low-profile path and well lights. It’s the fastest fix on the list and the one clients most often mistake for a failure.
Mechanical damage. Edgers, aerators, trenchers, fence post holes, and dogs. Nicked insulation on a shallow run shows up as an intermittent fault that only appears when the ground is wet.
Transformer terminal corrosion. Moisture in the enclosure plus a loose lug produces a system that shuts down randomly or won’t power up at all. Check terminal tightness on every visit.
Timer drift and dead photocells. Timer drift after an outage is common, cosmetic, and free to fix — but if you don’t check it, the client sees lights coming on at the wrong time and assumes the system is failing. Test the photocell while you’re there: cover it in daylight and confirm the system energizes. A system running around the clock, or never coming on, is a failed photocell far more often than it’s anything expensive.
Pests. Insects nest inside transformer enclosures and around tap connections, and rodents chew cable at grade. Clear nests out of the housing on every visit, and treat chewed insulation as a splice repair, not a wrap job.
Systems that outgrew their transformer. A system installed at 15 fixtures and expanded twice by someone else may now be running at or past its rating. If measured load is close to the plate rating, the fix is a properly sized unit — see the transformer sizing guide for the headroom math before you quote a replacement.
Servicing a System You Didn’t Install
Most maintenance work is on somebody else’s install, and it’s a different job from servicing your own.
You’re walking in with no run map, no load readings, no labeling at the transformer, and no idea where the splices are. Budget for that. The first visit on an inherited system is discovery, not repair — quote it as an assessment, walk the system, take readings, and locate what you can before you put a repair number in front of the client.
A wire tracer pays for itself on the first job. Finding a buried splice by digging is how an hour becomes four.
What to expect on the walk: pierce-point connectors, splices sitting at grade instead of buried and sealed, runs added after the original install with no transformer upgrade, and mismatched lamps from years of one-off repairs. None of that is a warranty issue you own, and it’s important the client understands the difference before you start.
Leave it better documented than you found it. Label the runs at the transformer, record load and voltage, and note where the splices are. That documentation is what makes the second visit profitable.
Talk to whoever mows. A large share of mechanical damage comes from the landscape crew, and they usually have no idea where the wire is. Marking fixture and run locations, and getting five minutes with the crew lead, prevents more damage than anything else on this list.
What Changes Season to Season
Spring. The frost heave and mulch visit, and the heaviest one of the year. Re-stake anything that lifted over winter, dig fixtures out from under fresh mulch, clear winter debris from transformer vents, and reset timers for longer days. Check for damage from snow removal along drives and walks.
Summer. Growth and heat. Plants that were dormant in April are now in the beam, and mulch piled during spring cleanup may be blocking transformer ventilation. This is the right visit for voltage spot-checks on the longest runs.
Fall. The readiness visit. Reset timers for early darkness, clear leaf litter off lenses and well light grates, verify the transformer is sealed and mounted before winter, and cut back growth that will trap moisture against fixtures. Photograph fixture locations before leaf and mulch cover — it’s the difference between a fast spring visit and a scavenger hunt.
Winter. Monitoring, not servicing. A zone that goes dark mid-winter is usually a fuse or a cable disturbed by frost. In freeze regions, confirm nothing sits where plow or shovel work will hit it, and keep snow off the transformer housing and photocell.
Landscape Lighting
Service Checklist
Run it in this order. The readings come before the repairs — what the meter says at the end of a run tells you where the rest of the visit goes.
1Before you touch anything
2Transformer and controls
3Readings
Measure at the fixture, not the transformer. Write the numbers down — next year’s readings on the same run are how you catch a connection going bad before the client does.
| Run | Tap | Load (W) | 1st fixture | Mid | Last |
|---|
4Connections and wire
5Fixtures, lenses, and lamps
6Aim, stake, and position
7Add for the season
8If you didn’t install it
First visit on an inherited system is discovery, not repair. Bill it that way.
9Close out
Restocking the truck? Thunder Lighting Supply carries contractor-grade connectors, direct burial wire, lamps, and transformers at wholesale pricing.
Turning Maintenance Into Recurring Revenue
The reason to formalize this is that it's the only part of the business that repeats without a new sale.
Most companies structure it as a tiered annual agreement: a basic once-a-year service, a mid tier with two visits, and a top tier adding priority scheduling and a short no-charge call between visits. Published homeowner-facing rates for annual maintenance plans generally run in the low hundreds per year, with per-visit service billed as a first-hour minimum plus hourly after that. Price yours against your own drive time and crew cost, not against a national average.
What makes the agreement worth selling, beyond the revenue:
- It keeps you on the property annually, which is where add-on fixtures and expansion work come from
- It catches degrading connections before the client experiences a failure
- It gives you a defensible position on warranty — a system serviced annually is a system you can stand behind
One honest note when you're pricing it: a well-built system with sealed connections and correctly sized runs needs less service labor than a cheap one. That's an argument for your install quality, not against the plan. Sell the plan on system life and single-point-of-contact, not on how much is going to break.
What to Stock for Service Season
A service truck that has to go back to the shop for a connector loses the margin on the call.
| Part | Why it's on the truck |
|---|---|
| Waterproof wire connectors | Every visit produces at least one splice to cut out and redo |
| Direct burial cable | Repairing edger and trencher strikes, extending relocated fixtures |
| Replacement lamps | Match wattage, beam angle, and color temperature to what's already in the system |
| Spare stakes, gaskets, and lenses | Frost heave and failed seals are found, not predicted |
| A transformer or two | Undersized and failed units turn a service call into a same-day upsell |
Carry a multimeter you trust, and keep a wire tracer on the truck if you service systems you didn't install — finding a buried splice without one burns an hour you didn't bill.
Common Landscape Lighting Maintenance Mistakes
Replacing lamps before taking readings. A dim fixture at the end of a long run is usually a voltage problem. New lamps look identical dim.
Re-sealing a bad connector instead of replacing it. Once corrosion has started at the conductor, the connection is done. Cut back to clean copper.
Skipping the night walk. Aim can only be checked after dark. A daytime-only visit misses glare, hot spots, and dark gaps entirely.
Not documenting the system. Label runs at the transformer and record load and voltage readings on every visit. Without that, every service call starts from zero — including yours next year.
Treating the annual visit as a warranty obligation. If it's free, it gets rushed, and the work that would have prevented next year's failure doesn't happen. Price it.
Stock the Truck for Service Season
Thunder Lighting Supply carries contractor-grade landscape lighting — fixtures, wire, connectors, lamps, and transformers — at wholesale pricing for professional installers. Building out a service program and want help spec'ing what to keep on the truck? Call us at (631) 803-9627.
CHECK OUT OUR LANDSCAPE LIGHTING COLLECTIONFAQs
What's the most common landscape lighting repair?
Failed wire connections. Pierce-point connectors and silicone-filled wire nuts that were never fully tightened account for the bulk of repair work on systems built by someone else. A 20-fixture system has at least 40 connections in it, and each unsealed one is a future call.
Why do landscape lights get dimmer over time?
Usually voltage, not the lamp. Take readings at the first, middle, and last fixture on the run — if the far end is low, you have a drop or a degrading connection, and swapping lamps won't fix it. Clouded lenses and dirty fixtures cost real output too, which is why lens cleaning is on the checklist.
How do I service a landscape lighting system another contractor installed?
Treat the first visit as an assessment and bill it that way. You have no run map, no load readings, and no record of where the splices are, so walk the system, take voltage readings at each run, and locate what you can before quoting repairs. Expect to find pierce-point connectors and unsealed splices. Label the runs and record the readings before you leave so the next visit isn't another discovery job.
