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True HID's are expensive the bulb itself is only 1 brightness, no filament its just gas that gets electrically charged like a continuous camera flash. So to have high and low beams with HDs the bulbs are actually moved or shaded by a moving flap. With aftermarket kits they are usually 2 bulbs and you get HID high beam but that shuts off when you swap to low beam for the normal halogen bulb.
Also the electronics on a HID are more sophisticated and less tolerant of shoddy installs.. we are talking hundreds of volts here through a ballast.
TRUE DOT certified HID kits are usualy in the thousands range.
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