On the question on lights above:
The oval portion of the track will be fully lit, as will the pits. The infield section will be lit enough so that corner workers can see cars, even those off track, and drivers can see flags. But cars must have lights. Standard headlights should be enough I would think but auxilary lights will be allowed.
We spent last night out in the cold testing lights. Our intention is to light the infield section to a level that will certainly feel different than driving in daylight.