... to choose HID lamp:Different lamps apply to different auto models, the HID Xenon lamps are separated into the following ... Lo beam: H4H/L, H13H/L, 9004/9007H/LBi-xenon projector lens: H4, H1/H7, 9004/9007, 9005 ... magnetic control unit inside, making bulb tube move in and out to creat high and low beam2) UV ... 10 years HID factory ,Best And competitive HID xenon kit in market ,HID kit H1,H7,H11,9005,9006