For the general purpose lighting use six eight foot long tube fluorescent light fixtures. Arrange them into three rows with each row consisting of two fixtures. Two rows next to the outside opposite walls and the third row going down the middle of the building.

The first row the long side of the fixture will be five feet from the wall. The end of the fixture will be four and a half feet from the wall. The second fixture in the row will be four and a half feet from the first fixture (inline). Do this for both of the outside rows. Center the middle row down the middle of the building. There should be about ten feet of space between either of the outside rows of fixtures.

Another way to increase the lighting in a workspace without hanging additional lights is to paint the walls and ceiling white. Yeah, it can look a bit boring, however, white or light colored paint reflects light very well and will make the space look brighter with fewer lights.

Most wood framed garages and free standing utility buildings have a layer of black tar paper, or black felt paper, nailed over the studs before the outside sheathing is applied as a moister barrier. If the shop walls are left unfinished, the black walls will make the space look very dark. Even with a lot of lighting the workshop will still appear dark and cave like. Either finish out the walls in sheet rock or quarter inch plywood. And then paint it a light color.