Radio Interference

This is one of the reasons I never took the plunge for LED for my old iron, especially ones with working radios. I've installed LED track lighting in the house, and doing research prior to that I've discovered the importance of FCC compliance. While FCC doesn't apply here, again I've discovered LED bulbs "can" cause EMI in radio reception be that AM, FM, handset, or WiFi in the home. My take is it seems to be the bulbs themselves in their intregated switching to fire the diode; usually the cheaper ones have the problem. People have added chokes or ferrite beads in the bulb's voltage supply to varying results or success. I believe the better manufacturers control this, but I don't know what's under the hood except higher price could mean better quality. If the vendor doesn't know, I would have to find one that does; or for that matter what do the guys who build emergency service vehicles use? Some of those are rolling carnivals.