hey thanks... i dont have a vent setup.. i just leave the door cracked so theres some flow...at night i leave it wide open so it drops to like 75... the plants are getting fairly big.. 2 of em are droopy and i think it could br cause i over watered... i would say the 25 tubes are cooler than the cfl's but i dont think the output it enough.. which is why i put both.. if your plant tips are getting toasted, then your lights could be too close.