You spent good money to light up your home’s landscaping—only to have a fixture blink, flicker, or burn out months (or even weeks) after install. And now you’re wondering: “Why does this keep happening?”
You’re not alone. This is one of the most common outdoor lighting frustrations we fix for homeowners across the DMV.
Here’s the real story behind blinking and burned-out landscape lights—and how we fix them for good.
Common Causes of Blinking or Burnout
1. Voltage Drop
This is the number one cause of dim, flickering, or prematurely failed lights.
When too many fixtures are installed on a long run of wire without proper voltage regulation, the lights farthest from the transformer don’t get enough power.
Symptoms: – Lights closest to transformer are bright – Lights farther away are dim, blink, or fail – Intermittent performance across zones
TLC Fix: We use multi-tap transformers and voltage meters to balance load across all zones. We also design wiring in “home run” or “T” configurations—not daisy-chained runs that cause drop. We calculate total wattage and wire length, and install appropriately sized cable to maintain stable voltage.
2. Improper Wire Connections
Outdoor wiring needs to withstand weather, moisture, and ground movement. Cheap wire nuts or exposed splices fail quickly.
Symptoms: – Lights flicker when it rains or during irrigation – Lights blink when jostled or walked on – Lights cut out after several months
TLC Fix: We use waterproof gel-filled connectors and direct-burial splice kits rated for decades of service. Every connection is tested for continuity, sealed in gel, and buried below grade for durability and safety.
DIY Red Flag: If your lights flicker after heavy rain, it’s often a sign that an open or taped wire is letting in water.
3. Low-Quality Fixtures
Not all landscape lighting is built the same. Big-box store fixtures often use cheap sockets, low-grade LEDs, or plastic seals that fail fast.
Symptoms: – Early burnout (within 6–12 months) – Buzzing sounds or light distortion – Lenses fogged with moisture – Color shifting (blue or purple hue)
TLC Fix: We install commercial-grade LED fixtures with 10-year warranties and fully sealed housings. Our fixtures feature corrosion-resistant materials (like brass or powder-coated aluminum), replaceable components, and heat sinks to prevent overheating.
Homeowner Tip: If you paid under $50 per fixture and it’s blinking, it’s probably the fixture—not the install.
4. Transformer Overload
If too many fixtures are added to a transformer that’s too small, it can’t handle the demand.
Symptoms: – All lights dim or blink together – Lights cut out after warming up – Transformer buzzes or feels hot to the touch
TLC Fix: We calculate total wattage load per zone and size your transformer with at least 20% overhead. We use transformers with multiple taps (12V–15V) to balance voltage across long runs. We also separate high-load and low-load zones for reliability.
Add-On Feature: Smart transformers with onboard diagnostics can alert us when voltage drops occur.
5. Moisture Intrusion
Even sealed lights can let in water if installed poorly, angled upward, or submerged during heavy rain.
Symptoms: – Condensation under lens – Bulbs corroding or cracking – Intermittent blinking in wet conditions
TLC Fix: We elevate fixtures when needed, use appropriate gaskets, and choose IP65+ rated fixtures for vulnerable zones. We avoid placing fixtures in low-lying areas unless drainage is improved first.
Bonus: We offer coastal-rated fixtures for homes near Chesapeake Bay or salt-heavy zones.
Real Homeowner Example: Annapolis, MD
A customer called us after their new (non-TLC) lighting system began flickering after every rain. Upon inspection: – Wire splices were exposed – Fixtures were bargain-brand with plastic housings – Transformer was undersized
We redesigned the layout, installed professional-grade path and uplights, and upgraded to a 300W multi-tap transformer.
Result: No more flicker. Dramatically better brightness. Warranty-backed for 10+ years. And most importantly: peace of mind.
Homeowner Quote: “Every time it rained, the lights glitched. I thought we’d just have to live with it. Bob’s team found the issue, replaced the junk, and now the system runs like a dream.”
Other Lesser-Known Issues
Rodent Damage
Mice and voles sometimes chew through underground wire insulation, causing shorts or cuts that result in blinking lights.
TLC Solution: We install rodent-resistant sheathed wiring and use protective conduit where necessary.
Corrosion on Contacts
In salty or damp conditions, wire terminals and socket contacts can corrode, causing unreliable conductivity.
TLC Solution: We use marine-grade grease and sealed fixture bases to reduce oxidation.
What We Do Differently at TLC
Here’s what sets our lighting installs apart: – We meter every line to ensure proper voltage at the start and end of every run. – We photograph and document every splice, connection, and transformer tap. – We spec only sealed, pro-grade fixtures that meet industry standards and carry real warranties. – We train our crew on water mitigation, low-voltage code, and regional challenges like clay soil and freeze-thaw conditions. – We follow up—one visit to test, one to adjust after dark.
Smart Monitoring Options: We offer lighting systems with remote access and monitoring to detect failures and send alerts when a fixture goes offline.
How to Protect Your System Going Forward
If your current system was installed by someone else, or DIY, here’s what you can do:
- Inspect Your Transformer Make sure it’s not overloaded. Add up the wattage of every fixture and compare it to the transformer’s capacity.
- Check Wire Connections Dig up a few and inspect. Are they gel-filled and sealed, or taped together? If they’re crimped, rusted, or damp—get them replaced.
- Run a Voltage Test Use a multimeter to test voltage at the transformer and the furthest fixture. A difference of more than 1.5V usually means a voltage drop issue.
- Replace Low-End Fixtures Start with the worst-performing zones. Upgrade to sealed, metal-bodied LED units with long warranties.
- Schedule a Professional Audit We’ll walk your system, run tests, map every run, and create a clear list of what needs upgrading now—and what can wait.
Final Word from Bob
If your lights are blinking, dim, or burning out early—it’s not just a bad bulb. It’s usually the system design.
Too many homeowners spend money fixing symptoms instead of solving root problems. At TLC, we build lighting systems to last: – Clean power – Clean wiring – Clean installation
If your lighting isn’t doing what it should, let us take a look. We’ll measure, test, and fix it right—with the kind of workmanship and accountability that makes the whole system shine.
They asked. Bob Carr answered.