I remember reading somewhere (Dave DeWitt?), that using foil to redirect light is not a good idea because the foil will most likely be wrinkled and these wrinkles create hot spots of directed light back to the plants. Metal sheeting or silver painted surfaces are therefore preferable to foil. I have used white board (white foam board found at art stores) to bounce light back to my plants with great sucess. Cheers, -- Robert Lusk aka: The Pepper Fool http://www.PepperFool.com Recipes, Photos, Restaurant Reviews and more..