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How to Choose a Lighting Transformer

A low-voltage transformer steps 120V household power down to the 12 to 15V your landscape fixtures run on. Total the wattage of every fixture and pick a transformer rated about 25% above that, leaving headroom to add lights later.

On long runs, voltage drop dims the far fixtures — a multi-tap transformer (12/13/14/15V) and heavier-gauge wire keep brightness even end to end. A built-in timer or photocell switches the system on at dusk and off on a schedule.

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