Just finished today's project. Took down 8 existing flourescent fixtures which were looking rather beat up, cracked, and tired. Kept the best three, moved them to the middle of the room for general lighting. Bought 12 new 4 footers, installed them around the perimeter of the room over the shelves... all wired up, lamps and lens installed, and she all works! What a job, I'm glad it is done. Tomorrow I will be back to actually doing "railroad stuff - I plan to try my hand at casting some culverts and retaining walls out of plaster. But back to the electricity stuff. Remember folks, electricity ain't no hobby. Don't try this at home. Call a licensed electrician. You have been warned!