Why are 12 V transformers so popular for outdoor low-voltage landscape lighting systems vs using a 12 V switch-mode power supply?
From my understanding, a switch-mode power supply is smaller, more efficient, and cheaper than a transformer (as well as quieter as there is no transformer AC hum). Is there a safety or reliability issue, or something else?
As an example, you can search Amazon for
12v outdoor lighting power supply to see the variants.