They are superb quality, I'm extremely satisfied with them, had them installed. Night driving is very convenient with these, 4200k is the best color. Installing them is extremely easy and takes about 30 minutes end to end when you read the manual. There is space beneath the headlamps where you can conveniently put the ballasts, I will leave it to you to figure out the specifics and the extent you want to insulate/tie up the ballasts and the main bulb as well. In any case, do not touch the HID bulbs as hands are oily/dirty, and that oil/dirt sticks to the bulb causing trouble later when the bulbs heat up, and they heat up on the extreme end