The cheap HID lights also help in enhancing the style of your car besides improving the safety aspect. The H4 HID conversion kits and HID headlight kits make the task of installing HID headlight bulbs easy on those vehicles that do not have them. Each HID kit consists of 2 bulbs, 2 ballasts and their mounting brackets along with installation instructions. You can easily find out the bulb size in respect of your vehicle by visiting the bulb guide and clicking on the relevant button. The average life of an HID kit is around 3000 hours and all kits are the plug-n-play kind and no splicing or modification of any kind is necessary. You can make both the Hi and Lo beam HID and the Bi-Xenon kit will give you both bulbs that are HID by ordering only one HID kit. However, this is an option for only those vehicles that have one bulb for both the Hi and the Lo beams.