My shop is 30 x 30 with a 10 foot ceiling, heated and cooled, painted one coat of base white. I used eight 8-foot double tube lights arranged in four rows. Left a little room at the center of the ceiling and placed the rows a little closer to the walls to get good light bounce. It's all the light I need. Originally was going to put up 16 4-foot lights. Glad I went with the 8 footers instead. Also have 2 8-foot work benches with two 4-foot lights each. My wife calls it the "man building."
