How to Choose the Right Transformer for Your Outdoor Lighting

Why the Right Transformer Makes a Big Difference

If your outdoor lights flicker, look dim, or fail early, the problem often isn’t the fixtures — it’s the transformer.

At Sun Bright Lighting, we help homeowners choose the right transformer so their lighting system stays bright, safe, and reliable.

What Is a Landscape Lighting Transformer?

A transformer reduces your home’s standard 120-volt power to low-voltage power (typically 12V) used by landscape lighting.

The right transformer ensures:

  • Even brightness

  • Safe operation

  • Longer bulb and fixture life

Step 1: Add Up Your Lighting Wattage

Check the wattage of each fixture and add them together.

Example:

  • 8 lights × 6W = 48W

  • 6 lights × 8W = 48W
    Total = 96W

Step 2: Don’t Use 100% of the Transformer

A transformer should only be used at about 75–80% capacity.

This helps prevent overheating and gives you flexibility later.

96W ÷ 0.75 = 128W

A 150W transformer would be a great choice here.

Step 3: Select the Right Size

Transformer Size Ideal Use
100W Small lighting setups
150W–200W Average front or backyard
300W Large homes or full landscapes

When in doubt, choose the next size up.

Step 4: Look for Adjustable Voltage Outputs

Transformers with multiple voltage outputs help keep lights evenly bright, especially when fixtures are far from the power source.

This helps avoid:

  • Dim lights at the end of runs

  • Uneven lighting appearance

Step 5: Think Ahead

Even if your system is small today, future upgrades are common. Choosing a slightly larger transformer now saves time and money later.

Common Mistakes to Avoid

  • Buying the smallest transformer possible

  • Ignoring future expansion

  • Using indoor transformers outdoors

  • Not accounting for voltage drop

Final Tip

A properly sized transformer is one of the most important parts of a successful outdoor lighting system. It keeps your lights performing the way they should — night after night.

☀️ Shop SunBrightLighting.com for reliable low-voltage transformers designed for easy installation and long-term performance.

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