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If your courtesy lights dim out, you'd need a controller circuit to power the relay. Otherwise, the relay would chatter as the voltage drops to near the relay solenoids threshold. This would cause premature failure of said relay and wreak havoc on the HID ballasts and bulbs.
You'd need a micro controller that applies/cuts power to the relay at a predetermined threshold.
Even with the controller, they'd want to come on and off a lot and would not be good for the HIDs. Incandescent fog or parking lights would be better.
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