It's easier than that. I installed low-voltage baby halogens atop my window inside frames for dramatic soft lighting of my drapes, but at TERRIBLE acoustic penalty...WITH wall-wart 12v transformers. And yes, they DO radiate into the audio...even when not on the same dedicated lines. OTOH I have in-room incandescents that are dimmed by a normal pot and they're COMPLETELY quiet!
So for $6 just get a rotary or slide dimmer and control incandescent 115 v lights, and leave the low voltage or halogen ornamentals for non-audio entertaining. I'm still surprised at the difference in noise level. I don't even hear incandescent filament "singing", either, from the 40 watt candelabra-shaped bulbs, whereas those baby halogens make muy system sound like my old short-wave receiver!
So for $6 just get a rotary or slide dimmer and control incandescent 115 v lights, and leave the low voltage or halogen ornamentals for non-audio entertaining. I'm still surprised at the difference in noise level. I don't even hear incandescent filament "singing", either, from the 40 watt candelabra-shaped bulbs, whereas those baby halogens make muy system sound like my old short-wave receiver!