kdspecial--yes I used 3-5 layers of duct tape around the doors on the hinge sides. For the top and bottom of the door opening I cut heavy cardboard to length and duct taped it to the door, with some overlap so it would make a flange and seal the top and bottom perfectly when shut. Then I put a couple layers of duct tape over the flanges, so it seals tighter. You may want to just try using weatherstripping material from lowe's, now that I think about it... it took me a couple hours to do the whole thing and it cost me $2. Eventually it will wear out, but for now that sucker is light-tight. The 100WHPS doesn't hardly get hot enough to hurt duct tape anyway.

Thanks for the comment, best of luck getting your own cabinet set up. I think my setup should produce enough for my personal use, and plus it's a stealthy little midget. The proof will be in the buddha!