I'm confused about headlights.
I have a 2003 STS with the projector type headlights. Are HID and Xenon the same thing?
Is there such a thing as projector type headlights that are not HID or Xenon? If so are they Halogen? Do they also need balists to operate?
Did any late model STS's come with non HID or Xenon headlights?