I added a 42w 6500k cfl into tent to help add little heat, at last check tent was about 80degree's....I will recheck in 20mins or so to see if it climbed anymore, if not I will probably add 1 more 42w or 23w depending what the temps are when I check,...I want my tent temps around 88ish...tonight they calling for frost, so I'm thinking the one 42w may not be enough to get temps high enough or hold it there..I finally got humidity levels balanced @75% just where I want to be...my dehumidifier has dial not numbers so takes little playing with it to find where i need it.. this time I think i will mark a line on unit where i'm at so I am close to 75% humidity at that setting,of course other factors involved outside temp & humidity, inside temps... when lights came on humidity was still little over 85% that is little on high side for me even for seedlings...