There are a few things to consider and keep in mind when purchasing an HID conversion kit:
The first thing you need to make sure of, is that the HID kit fits your vehicle. Check the bulb type, the power of the bulb and make sure it is compatible. Most bulbs are rated with the H number. For example, an H2 bulb is a totally different fitment to an H7 and this varies between manufacturers.
Make sure you know how to fit the kit. Some HID kits can be difficult to install and if you don’t feel confident, get a qualified mechanic to install it for you. Most HID conversion kits are plug & play but others might need additional mounting kits made up.
Check out what sort of ballast comes with the HID kit. Whether it is a digital, magnetic or an electronic ballast, you need to understand what the difference is and whether it fits into your budget when you are considering buying a HID kit.
There are usually two different power ratings for the bulbs, either 35w or 55w. The 35w bulbs will highly increase the performance of the headlamps on your car, but won’t be as bright as the 55w one. The 55w bulbs are generally more expensive but they won’t last as long and use more energy than the 35w bulbs. To make sure it is a wise investment, the 35w ones are usually the safer option, but won’t have the ultimate performance of the 55w.
Whichever HID kit you choose, you won’t be disappointed to get rid of those old, yellowing halogen bulbs which are pretty useless at night compared to the ever effective high intensity HID headlights which are now available. Choose your bulb rating for a pure white or blue/white coloring.