Hi folks, i'm doing a log for my polar express from auto seeds. I have one at the moment but have another seed on the way. I have a cab just over 2 feet with four 24w cfls, temp sits at 26.9C i have a 4 inch pc fan as an exhaust and another for circulation with a passive intake at the back. Seed took 24 hours to germ in paper towels and another day to sprout, had to help her with the seed casing but otherwise all is well so far 
good luck!