What is the difference between a transformer and a power supply ?
A. A transformer provides alternating current (a.c.) output of 12 or 24 volts; 12 volts a.c. is normally used to power halogen lamps in low voltage garden lights. A dc power supply provides direct current (d.c.) output (same as a battery) and is required for some light emitting diodes (l.e.d.s), such as MicroLED linear led lighting for example. L.e.d.s consume a lot less power than incandescent lamps and are generally less sensitive to small voltage reductions but note that l.e.d.s are vulnerable to overvoltage, so you should generally use a regulated 12 volt DC power supply to ensure stable voltage to a small group of led lights. Help sheet No. 3 l.e.d. garden lighting dc power supplies and Help sheet No.
