I'd leave the halo lights on 'cuz they're so pretty! :smile: Does that count for DRL or do the actual HIDs need to be on, too?
Depends on local regulations. In Canada they have to be brighter than parking lights, but don't have to be full brightness. I believe the regulations require them to be within a certain brightness range (min and max).
Apparently the USA rules are similar to Canada, but they are allowed rather than mandated.
In the early days it was fairly common for the high beams to operate at lower voltage, by putting the bulbs in series. Some cars actually use the turn signals, except of course when you are signalling turns (I think that has largely fell out of favor). Some cars have a separate bulb for the purpose.
It looks like my Infiniti G37 turns on the low beam HIDs.
The Roadster uses the low beam headlights. Basically you can't turn them off without powering down the car.
I suspect the halo lights would qualify. Hopefully!