Quote Originally Posted by Mr. Purple
I am not going over 100$ for a fan!
Then I suggest you chuck the whole deal right now before you spend any more money on burnt up plants. With HID, you'll want to spend as much, or more on ventilation than you do on lights.

HID is of course the prefered lighting method, but they get HOT! There is nobody that has ever run 600 watts of HID lighting in the space you mention, and spent less than $100 for ventilation.

Some things are just not possible, and what you are asking for is one of them.