Please read this warning that I have posted a few mins ago
http://www.fiatcoupeclub.org/forum/showflat.php?Cat=0&Number=49104&an=0&page=0#Post49104In terms of HID, there are hundreds of kits available, but please note there are definitely not the same.
Hella/Philips Ballasts with Philips gas discahrge bulbs are unmatched. Philips D2S Gas Discharge is the only one using a quartz crystal in the bulb glass.
The other huge misconception is the temperature of the bulb, lower = brighter. THe brightest gas discharge temp is around 4100K. The higher the temp the more blue it becomes, with 12000K being almost violet and with virtually no white light, which means very poor vision.
Check out the information here
http://www.autolamps-online.com/index.htmSpeak to Janet from autolamps, an undisputed expert in gas discharge bulbs.
Lastly Hella/Philips have never released technical info. on their bulbs, therefore those coming from Asia make claims not based on any viable research & development.
cheers
Nazo