Mercury HID Kit come in many specification. Many different HID kit Xenon bulb sizes, many different HID kit Xenon bulb temperature degrees (which allow for different colors to be emitted). Mercury HID kit bulb size are made in: H1, H3, H4, H7, h13, 9004, 9005, 9006, 9007, D1S, D2S Mercury HID kit bulb Temperature: 3000K (Golden Yellow) , 4300K (Bright White), 5000K (white), 6000K (Crystal White), 8000K (Crystal Blue), 10000K (Aqua Blue), 12000K (Purple-Blue) Mercury HID Kit allow the driver to have the best night visibility, which would increase the safety of their driving abilities. Even though Mercury HID Kit, are around $100-200 USD, are definitely worth every penny. Mercury HID can last 12 times longer than the average Halogen bulb, which is about 3000 hours compared to 250 hours.