OSRAM Xenarc D4S 5000K CBI (Cool Intense Blue) HID BULBS - PAIR (Xenon Corp) 5000K Color Temp (there is no 5500K for Osram D4S CBI) Up to 20% more brightness compared to standard D4S 4300K lamp Pure White color without sacrificing the OEM quality 100% Authentic OSRAM (Stay away from Chinese counterfeited ones) Sold in set of 2 bulbs