Landscape Lighting Transformers
A low voltage transformer is an electrical device that transforms 120 volts (line voltage) into 12 volts or 24 volts (low voltage). Low-voltage systems have several advantages for the home owner: Most important, low-voltage equipment is easier to install. Except for the transformer that's connected to a 120-volt circuit, the entire system runs on a harmless 12-volt current. The best advantage of low-voltage equipment is that it can be relatively inexpensive. When you do the job yourself, the bottom line for low-voltage looks even better.
The type of landscape transformer to select may depend on the size of the lighting job; design layout, watts required, length of cable runs.