Another ham op here, and the other comments off this parent are correct:
HIDs are discharge lamps like fluorescent, neon, etc, and by definition create tons of RF--remember the original spark gap transmitters? Using them in your car will \wipe everything out because it's conducted. Outside of there (on a pole, etc) it depends how efficiently it radiates and if it has anything to stop it at the source (ferrite, etc).
If you listen to an AM radio you'll hear the pops of the spark plugs firing (and sometimes the injectors). The plasma discharge will probably sound like this but lasting a bit longer.
As for the super short-sighted comment about not listening to radio, I'm in the same boat BUT that doesn't apply to other people and that also doesn't apply to 2-way radio that could get jammed by this such as on an ambulance, police car, or ham radio op's car.
Finally, as a reminder to the increasing amount of non-nerds here, this is what's being talked about but inside each cylinder:
https://www.youtube.com/result...