My shop is 24x32. One side has 10' ceilings with attic trusses for storage and the other side is vaulted up to about 16' high. I did a high lift door on that side that follows the angle of the trusses. Here's how I ended up doing my lighting:

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These are all standard output T8 fixtures. It worked out to the equivalent of 8 4' fixtures on each side. Painting the walls white also really helped. The shop is very bright and I rarely find myself even using task lighting of any kind.