The Fyrlyt 9000 24V lights come with 12 to 24 volt step-up transformers (one per light). You do not have to do anything additional to your vehicle to mount these lights.
I have them, and where I live - nothing comes near them in performance. I have a good set of HID driving lights on my work ute - the Fyrlyt's leave these for dead. Cooling issues on a D4 with these lights fitted - I've found this to be a bit of an old wife's tale. I have driven across the Nullarbor and other long distance trips in 40 plus degrees on many occasions - the only time that I have ever seen even a slight cooling issue with the D4 was once when the front of the vehicle was covered in locusts. The lights have never been an issue. [wink11]

