I would think RFI would be a UL test requirement.
It is in SOME applications. If the fixture is tested for use in Industrial environments, I believe it doesn't matter if it interferes with residential equipment. Just like big welders, they are not typically used in residential environments, therefore it doesn't matter if they interfere with TV and radio.
Try to determine if the interference is coming as radiated or conducted interference. Plug the radio into an extension cord that is plugged into another circuit. If the interference is significantly reduced or removed, the interfernce is being conducted into the radio thru the power line. A good line filter on the radio should fix the problem.
Larry C
