How do I size a transformer for my lighting installation?

Calculate the transformer required by determining the wattage of all your lighting fixtures. This is the minimum required output of the transformer. You typically want to choose a transformer that supplies no more than 33% more.

For example:

  • 10 LED wall lights @ 2.0 watts each = 20.0 watts
  • 10 LED deck lights @ 1.0 watts each = 10.0 watts
  • 5 LED path lights @ 3.0 watts each = 15.0 watts

In this example, the total minimum output required by the transformer is 45 watts. A 60 watt magnetic or electronic transformer would be ideal.

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