Quote Originally Posted by psteve
I'd use 1 inch foil coated foam core insulation from someplace like Home DePot..
You can cut it to fit, and it will reflect almost as well as white walls.
Be careful not to restrict air flow to your plants. It's more important than a little more reflected light.
Eventually you won't need anything. Those 5 plants should fill a 4x6 space nicely, with a bit of room for good light penetration.
Keep the lights as close as possible (like less than 6 inches) to the top of the plants.
foil toward or away from plants? i have 2X3 syrafoam sheets by my flowering girl right now, and i plan to move them in once shes done in a week or so.

PS: the freezer room is veg only, i have an entire bedroom to flower in under a 600w hps. its roughly a 7X5 area that the plants sit in, so maybe ill wall 3 sides with the foil stuff