Buy the one thats not made in China!!! I was one of the people that experienced the Gassing-Off Nightmare!! From what i've researched the Homebox looks like the only one w/o those issues.Just make sure you've got good airflow coming in down low i.e.sqirrel cage fan.And you're Carbon-scrubber mounted uptop to pull out the hot stinky air!! You will also need a smaller supplemental fan placed [BLOWING] between the plant tops and the lights to ensure adequate air circulation.I was running my Extraction air through the cool-tube light set-up and out...Otherwise you're looking at some extreme Heat build-up.During veg. I was using a regular 400w Metal halide reflector without heat issues, once I bumped up to 600w Hps, cool-tube was a necessity. Good luck