I recently built a similar box. Two tubs instead of three w/6 CFLs.

I kept the box in my basement at 52ish degrees for the first few days and nearly killed off my two 2 week old clones. CFLs produce some heat, but not enough to keep that space warm. They've since bounced back, but it definitely took a toll on them.
basement Reviewed by basement on . Temp. too cold? Rubbermaid Closet build After a night of internet surfing, someone on the forums posted a link to this guy's (Blue_Adept) rubbermaid stealth grow tub. At first i was planning on just going for a 250w HPS setup for about 4 plants but this seems more practical. Here is the link to the guys build. I can do it no problem i just have a few questions. (i dont want to sign up for another forum just to ask two questions so hopefully you guys can help me out here) Link: International Cannagraphic Magazine Forums - Rating: 5