Gymgirl said:Phillip,
I suggest enclosing your setup on three sides with the foil/mylar sheeting: the back & the two sides. Leave the front open for EZ access for watering, tending, looking, air flow, etc. Your top will be a shelf, LOL!
I agree -- not sure what the conditions are where you will have those plants, but air flow is really important; running a fan to provide better air flow is not a bad idea. If the plants are too warm, and no air flow, they will be very weak. That said, my plant light shelves are set up out in our workshop, which stays quite cool until the weather really warms up (our furnace is in that room, but no actual heat ducts or whatever; so it stays around 50 in the coldest winter weather, and progressively higher as the outside temp increases). I do have a big sheet of plastic wrapped around the entire unit to hold in the heat from the lights when I start seeds in February, but open it partially as the temperature starts to rise.
