These Philips bulbs are approved by Philips,you can find label "Philips patent license" on the base. Raw materials of these Philips bulbs include UV-CUT Bulbs(original Philips quartz
glass), electrode and Molybdenum from Sweden, pills of the United States, German xenon, 99.99% purity mercury of USA, and so on. The advantage of These Philips bulbs is high brighter and low consumption. 

Base type of the xenon headlight bulbs include: H1, H3, H4, H4H, H4H/L, H7, H7C, H7T, H7R, H8, H9, H10, H11, H13, H13L, H13H/L, 9004, 9004L, 9005, 9006, 9007, 9007L, 9004-9007H/L, 880/881, H6(single claw,three claw)