Generally no but it may happen under certain circumstances for a combination of reasons and can usually be alleviated; some LED types are more prone, exacerbated by local conditions and installation. All electrical products generate unwanted signals and must meet defined standards that must not be exceeded in order to display the CE mark. Conversely radios must be immune to defined levels of unwanted signals in order to display a CE mark. If for instance a radio is operating in a low signal strength area with a telescopic aerial, it is possible that a combination of LEDs, power supplies and wiring layout can cause issues; different combinations will perform differently. The product supplier should be able to offer remedial advice and assistance if issues arise.