I can get roughly 8 more according to the manager at HD. I have 3 extras already. I'm extremely impressed w/ the quality for $20. No they aren't perfect but I don't think you could ask for more for the cost. Also, a positive comment for HD, they sold me 6 T8 fixtures all of which were missing hardware and only partially drilled, so when I had to drive all the way back tonight (an hour each way), they gave me a model that was $10 more each for the same price. Saved me roughly $60, more than enough to cover my gas. Kudos to Home Depot! :bigups