Top Reasons Low-Voltage Landscape Bulbs Burn Out — and How to Stop It

Your low-voltage landscape lighting system transforms your yard into a warm, inviting retreat after dark. But if your bulbs keep burning out too soon, something’s wrong — and it’s costing you time and money.

At Sun Bright Lighting, we believe outdoor lighting should be low-maintenance, energy-efficient, and built to last. Let’s look at why bulbs fail and how to prevent these problems once and for all.

1. Uneven Voltage Distribution

Voltage drop is the most frequent cause of early bulb failure in low-voltage systems. It happens when wire runs are too long or the load isn’t balanced properly.

What happens:

  • Fixtures close to the transformer get higher voltage

  • Those farther away receive less power

Solution:

  • Use heavier gauge wire (10 or 12 AWG) for long runs

  • Keep runs under 100 feet when possible

  • Arrange fixtures using T-connections or loop circuits for balanced voltage

2. Incorrect Transformer Sizing

A transformer that’s too small or too powerful for your system will shorten bulb life.

Fix it:

  • Calculate total wattage (add up all bulbs’ wattage)

  • Choose a transformer rated for 20–30% more than total load

  • If your transformer offers multiple voltage taps, measure and adjust output for 11–12V at each fixture

Sun Bright Lighting’s professional-grade transformers make it easy to fine-tune output and protect your lighting investment.

3. Low-Quality or Improper Bulbs

Using non-rated bulbs can cause overheating, dim light, or early burnout.

Pro Tip:

  • Always use 12V-rated LED or halogen bulbs specifically designed for outdoor landscape systems

  • Invest in quality LED bulbs — they produce less heat and can last up to 10x longer than halogen bulbs

4. Water and Moisture Issues

Outdoor lighting systems face rain, dew, and irrigation spray. Water that sneaks into fixtures can corrode contacts and destroy bulbs.

Prevent it:

  • Inspect seals and gaskets regularly

  • Keep lenses clean and fixtures angled away from sprinklers

  • Use waterproof, IP-rated fixtures for durability in all climates

Sun Bright Lighting’s fixtures are built with weatherproof seals and marine-grade stainless steel, ensuring your system stays bright and protected year-round.

5. Loose or Corroded Connections

Corrosion increases electrical resistance, leading to power fluctuations that shorten bulb life.

Fix it:

  • Use silicone-filled connectors

  • Keep wire splices above ground or use junction boxes

  • Check for discolored or loose connectors during seasonal maintenance

6. Overheating and Enclosure Design

Bulbs that run too hot degrade faster — especially if placed in tight or enclosed fixtures.

Solution:

  • Choose LED replacements for cooler operation

  • Avoid over-wattage bulbs

  • Ensure fixtures have airflow or venting

Keep Your Lights Shining Brighter, Longer

A well-designed system with quality components can last for years with minimal upkeep.

🌟 At Sun Bright Lighting, we supply top-quality LED bulbs, transformers, and fixtures engineered for maximum performance and longevity — so you can focus on enjoying your beautiful outdoor space.

✨ Visit SunBrightLighting.com to explore durable, energy-efficient lighting solutions that keep your nights glowing beautifully.

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