First I'd say use some black velcro all around the edges to seal it up. Light passes through most thin materials to some extent. Maybe you could get aluminum tape, and coat some plastic sheeting with it.
phytokind Reviewed by phytokind on . lightproof door for new cab I've built a new cab 2'x3'x5.5' for flowering clones in using 400w cfl. What can I use to make a light proof door? It needs to be something that I can roll-up as there is not enough room for a proper hinged door. Mylar seems way to flimsy. I was thinking of using velcro to fasten it (whatever 'it' is). Anyone got any ideas or tips? Cheers. Rating: 5