i'm starting to go 12/12 and i have a slight heat problem. when i close the cab doors the temps rise to over 92 degrees and i have 2 fans going, but when i crack the doors about 6 inches open the temps stay around 82 degrees. my question is , is it ok to have the doors cracked open for the 12 hours of light or am i taking away from the strength of the light and getting ready to cause problems down the line? i appreciate all the help the community offers. i've been reading alot of the posts but couldn't find a answer to this particular problem.also how far should the light be from the top of the plants,i'm using a 150 watt hps and i dont want to burn them because i cant watch them for the whole 12 hours.more questions to come if i can't find the answers somewhere in the faq's.thx in advance.