I have a very old grow cart that has spots in between the 4' fluoros for incandescent lighting. I took out the old bulbs in put in those new compact flourescents (The kind with the self contained ballast that you can screw in). Works great plus extra light. Go for the four footer. Iris and I disagree on the choice of bulbs, however. I have used the grow lights from several different companies and I find that one cool and one warm work wonderfully. I will try to look at the package to tell you what specifically I have-----
-Terri
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