Romaine Lettuce Experiment Part 2

Nice setup metformin 500 mg 500 tablets and interesting experiments. I like the styrofoam but I thought roots like it as dark as possible and this material seems to let light trough. I'd like to know how that works out, I might adapt this if it doesn't cause problems (or I'll put some light tight black/white foil-”discs” over the styrofoam. I can't find cheap neoprene sheets to do the trick, they seem to be used in other professional aero systems.