"COLIN LAMB" ) writes:

It is possible to buy dimmers that do not emit significant radiation.
Usually, they are advertised as such and more expensive.


In Canada, many of the better dimmers sold have a "CE" label on them,
meaning that they meet a European specification which is less tolerant of
RFI than the specs in North America. If you can find them, buy them
instead.

.... Martin VE3OAT