[JRTJH]

Many, probably "most" LED light fixtures are "bi-directional" meaning that they can be connected without regard to the POS/NEG connections. Older LED's will not work if connected incorrectly. On some of the newer LED fixtures, if there is interference with the radio signal, often, just changing the "bi-directional connection" will stop the interference.

So, if you have one light that causes radio interference, you can pull that light fixture, swap the POS/NEG leads to the light and try again. It may fix your problem, but it also may not fix it. Worth a try, and the "cost is negligible"...