Article 410.64 and 410.65.
I mention these but in the field I've never seen nor dug enough to note what makes these two
articles permissable on a piece of equipment. I'll assume it's in the cut sheets but these don't always hit the floor!
PO, it's nice to have all the power to a box located close to switch and the first set of light(s),
at least then you don't have to tear a light apart to check something, or drag out a wad of wires out of the top
of a light fixture.
I don't understand why your going so far, being ten foot off the wall is not unrealistic to the first
light but i know of no requirement of a limit of a max run, just support it.