We prefer 35w HID because 55w HID is sometimes just a marketing gimmick. 55w HID headlights can be hard on your car’s electrical system and it creates more heat which can shorten the life of your bulbs. A 35w system gives you a good balance of producing a bright, high-quality light while lasting a long time and not making too much heat. For a high-quality 55w HID headlight conversion kit that will last a long time, you usually need to spend quite a bit more money than you would on a good 35w kit.