I havent read all of the replies here,but here is my 2 cts.worth.I had the old 8 ft. flourescent fixtures in my shop.When they started accting up I replaced them with 4 ft.2 bulb fixtures.Not the expensive one either.These cost somewhere around $10.or $12 each,complete with bulbs.They work out very good.You can get them at HD,Lowes.,Walmart,etc.Usually called shop lights.I would start out with 6 of these,and go from there.6 might be enough.