i had 4 SF 1000's going along with with a 2000 and found the heat to be much for my setup. fine lights i guess just not for my needs, i run around 73-77 with around 12-14 plants in flower and the heat and struggle with RH were too much. i replaced em with COB's and find keeping my room in target range far easier for me. BOLWhat size space??? My 2 600's keep my space at 82 degrees, which is perfect. You can mount your drivers outside of the tent.