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I do something similar, using a folding table, I only get one set of lights, I like this increase in use of floor space! I get carried away with things I want to start before I am ready to heat the greenhouse (zone 3).
I do two other things that may or may not be helpful to some, I put clear plastic over the light and allow it to hang down to the edges of the table...I use clothespins to hold the ends together. Serves 2 funtions: keeps in moisture and keeps my cats OUT!! The other thing is to use old heating pads under the seed flats for germination.