My apologies for repeating a common thread. I have a question about lights. My grow box is 9 sq feet (18 in x 24 in x36 in). Thermopan reflective cardboard. 8 x 40 watt cfl bulbs (2800 lumens per ). 2 cpu fans intake / output . Box interior in the 70 to 80 degree range. I have the bulbs about 3 to 4 inches away. My 3 week old aurora indica girl is thriving. I topped her a week ago. She is ready to go. In past grows , my top leaves stress but the light were closer in areas. With this one, I may keep more distance ( 3 to 4 in. or greater ). I hope to avoid heat or light stress. I welcome any thoughts.