the 120 volts system need to be wired in a safe manner since they have
120 Volts on them...

the low voltage side are less dangerous....

the low voltage bulbs are more redialy avaialbe and probably last
longer because the filamnets are thicker...

the low voltage systems need a transformer, 120 volts don't

the problem is .....most of these lighting transformers are acutally
switching power supplies that create radio and TV interference and may
not work right with a dimmer... If it is a true transformer it will be
large and pretty heavy...

I use a 120 volt system with a dimmer..

Mark