Yes, HIDs are illegal because they are not DOT approved. The only HIDs that are DOT approved usually come stock in the vehicle or is an OEM addition and not aftermarket. Do I care about it being illegal? F*ck no, I am more visible. My low beam is purposely angled down to not be so bright as to blind people. It is still much brighter than stock lights. Cops here don't care or look for it, I have asked them. Just stay away from the odd color ones, like purple.
2005 Honda CRF88RR - 2007 Honda CBR600RR