We spent a lot of time and probably too much money on this when we built our shop, but the results were great and I wouldn't change a thing.
40' x 52' shop with 96 4' T8s. 24 8' fixtures with 4 4' bulbs each. White ceilings and walls. After not finding anything to suit us at the big box stores, we spec'd these fixtures from an online lighting and design site. Our electrical guy ordered them at his supplier. The shades have perforations to get a percentage of the light on the ceiling and dispersed to help eliminate dark spots. We have them switched so that we can turn on as much as we need, where we need it. The front and rear rows are shaded toward the front and rear walls and the ends of the rows are near the side walls. Lighting on the benches and areas at the walls is excellent.