Anyone building a workshop should look at this article "Lighting for the Workshop" by Jack L. Lindsey. He is a retired engineer specializing in commercial & industrial lighting.
You can purchase the article from Fine Woodworking Online Archives, Feb 2002.
I purchased the article before I built my shop and have been happy with the lighting plan. The author provides a formula that takes into account the height of the ceiling from the worktop and the distance between the rows of lights. He also addresses the best type of lighting.

http://www.taunton.com/store/fwarchi...p?searchChar=L
I hope this link works, if not, try you search engine.
Jerry