Calculate the transformer required by determining the total wattage of all lighting fixtures. This is the minimum required output of the transformer. You typically want to choose a transformer that supplies no more than 30% more.
- 10 LED wall lights @ 2 watts each = 20 watts
- 10 LED deck lights @ 1 watt each = 10 watts
- 5 LED path lights @ 3 watts = 15 watts
- Total minimum output required by the transformer = 45 watts
In this example, a 60 watt magnetic or electronic transformer would be ideal.