Because the HID are 35 watt and must have a ballast they should each flicker 1 time during warm up.... This is because the ballast has to complete the voltage converting. after the 1 time flicker thay should not flicker anymore. As for the radio reception, its RFI. The best way to reduce this is to go to radio shack and purchase some RFI filters. They snap onto the wires of the ballast at both ends.