Also sometime it could cause serious damage. Alot of cars with projectors have ballast which as you know control the power outage of the HID. Well the manufactures seal these ballast with sillicon or plastic shells. Well car's who dont have HID and just stick these in there usually forget one thing. Is to seal the freaking ballast up or something....because low and behold water gets into them they start to fry and maybe catch your engine on fire before. Someone on Preludeonline forgot to seal his ballast up and water proof it and while he was driving it started to rain bad and water seeped into his hood....and short circuted his headlamps and BAM it was gone and smoke started to arise.