Not sure how to do this other than turning the lights off? We have tried replacing all the cables, battery, put a power conditioner on the electric etc... all to no avail.
The fact it DOESN'T hum when lights are off shows some promise…just have to ID the conflict which is outside my purview. Shared circuits, rheostats, etc. can create problems as described. I'll be damned if I'm purchasing anything when the problem (…and solution!) resides elsewhere. Hoping somebody chimes-in with some better solutions.
Riis