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.
- 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.