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The DOT regulates the aim, intensity, and beam pattern of a headlight.  If the headlight does not conform to these standards it is not "road legal".  That is why most alternate-design aftermarket headlights state that they are "for off-road use only".  Even if the aiming and the beam pattern are fine, an HID bulb of 55 watts would throw out significantly more lumens than a standard 35 watt HID bulb.  This could, conceivably, create massive amounts of glare for other motorists.