A little bit of knowledge is dangerous.
Agreed, so take some advice from someone with 35 years in the trade.
Unless the dimmers in the US use an isolating transformer they will be the same as the electronic dimmers used around the rest of the world. A dimmer is not designed to reduce the voltage, they chop the waveform of the AC current.
http://www.sprags.com/
It's not safe & you will get booted from the output. - John.