i am growing in a rubbermaid container (with no lid on) and i dont know the temp but i can assure you if i was small enough to live in that box, i would have no problem with the temp. I put my hand over the plant and i cant feel any heat from the light at all, the only other info i can think of telling you is that i previously had the plant in some crappy soil that was very high in nitrogen and basically what i did was ripped the poor looking plant out of that soil which ripped about 95% of the roots off and stuck it into the promix organic. but this was about 2 weeks ago and since then the plant has been growing wonderfuly until about 2 days ago. but i will move it a little further from the light for a day or 2 and see if that helps the situation