mylar was probably going to be my next cheep "upgrade".... does my idea for creating more room to grow sound like it will work to you? as soon as the plant starts to get too big to just be sitting inside the box, i was going to create some sort of platform or table with a big circular hole cut...
Ok i just finished making a grow box out of some rubbermaid drawers. It stands 2 feet and 1 inch tall. It is probably just as wide as that and probably half as deep as that (2 x 1 x 2 ft). I am have 6 26w soft white cfl's in there at the moment, I can't remember the lumens but i know it is over...