yup outkasted is right... you can buy a d2s or d2r based HID bulb and ballast (stock for HID equipped cars) and if you have an H4 base you can buy something called casper shields that accepts the d2s/d2r bulb to fit perfectly on your headlight and it wouldnt blind people as much. but buying a kit from a sponsor online is just rebased bulbs that will fit any socket which will have crazy glare..