I downloaded the Lithonia software -- actually very nice and pretty easy to use -- and am re-laying out my lights. Thanks for all the input from members here. Anyway I chose 35 footcandles as the desired light level. Seem reasonable? This resulted in 12, 4 foot 2 light T5 35W covered fixtures. Amazon has the SB232 120 GESB units for pretty cheap.
I'll make the workshop much brighter.
Here's the new layout
garage lighting.jpg