"Marty, what have you decided to do? My guess is you're going with some suspended fixtures, since I don't think you plan to put a drywalled ceiling in your shop. I don't want those.
I will put 3 eight foot lights per truss so nine total in the main body of the shop, in the future i will do something different in the lean tube portion as i want a loft in that area so it will have a ceiling to it.