Thanks for your responds, guys. What do you actually think about getting this ballast with cooltube? http://www.ebay.co.uk/itm/Cool-Tube-Air-Cooled-Reflector-LIGHT-KIT-600w-for-grow-tents-Hydroponics-/121118603038?pt=LH_DefaultDomain_3&hash=item1c333b371e It can't be that bad, right? :) Also, is...