El-cheapo lamp dimmers are some of the most evil devices you can imagine. The noise they
can put on the AC line is just amazing.
Buy the high end lutron dimmers. Back to back mosfets, full wave, microprocessor controlled
and automatically adjust for forward or reverse phase control when driving high voltage led's
and other nasty loads.
Every single dimmer in my house got upgraded to RA2 and have not had any interference
problems since. There are non RA2 versions that are exactly the same thing.