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Landscape Lighting Transformer Sizing: Watts, Tap Voltage, and Load Planning

Load Math That Survives Summer

Add fixture wattages (or VA) and multiply by manufacturer minimum headroom—often 20–25%. LED loads are lower but inrush still matters on some transformers.

Voltage Drop Planning

Long homeruns need thicker gauge or multi-tap transformers. Sketch zones so no leg runs near max length for its gauge.

Tap Strategy

Distribute load across commons and taps to balance voltage. Dark fixtures often trace to a single overloaded common.

Controller Features

Astronomic timers and app control reduce manual errors—pair with photocells where required by code.

Frequently Asked Questions

Can I mix halogen and LED?

Avoid on the same run if loads confuse tap selection—separate circuits when possible.

Why do LEDs flicker?

Undervoltage, incompatible dimmers, or bad splices.