I am running mine long ways in my 50x30. Will be hanging them in a few weeks. I have 7 rows running the 50' length. Within each row I wired up via outlets so that I can run 2-4 lights in any given row across the 30'. I staggered some of my ceiling outlets as to spread out the light more. If need be. Plan on using 17 to 21 lights in total. Going to wire up 17 and see how brite it is, first.
I put outlets in my ceiling so I can move lights pretty much anywhere I need them. Got that suggestions from some good guys on this site!
I have bought t8, 4', 4 bulb fixtures. I only have 9' of ceiling though.