You might try the following site to see if there is any info posted about RFI. I think most manufacturers offer an RFI filter but that is probably to prevent RFI entering the wiring system. Since electronic ballasts operate at a high frequency, there might be direct transmission through the air to the radio.

Magnetek has sold its product line to Universal

http://www.universalballast.com/

Few things are harder to put up with than the annoyance of a good example.