HOD ,which is put a little xenon in the halogen without ballast new product HODwhich is put the a little xenon into the halogen bulb,and the brightness is less than HID,and it needn't ballast,just change the bulb,it will be ok.And the price is very cheap,we have two type of HOD.The bulb with wire is only $6.00/pair good quality hod bulb for car 9004