I added a long regular fluro to the inside of my box and that is pretty close to theplants and it doesn't get to hot. Also, its much different then my compact fluros. It kinda gives off a purpleish blue light. Is this the blue spectrum? I have a fan blowing on them 24/7, and I plan to get pots for them tomorrow. Also, yes Zandor, I have hold on the bottoms of the cups for drainage. They've gotton alot bigger already with all the light they had last night (put the lights closer).