so i just bought my grow light.. a 400 watt hps, but without a cool tube..so im thinking about buying a cool tube from htgsupply but im not so sure how to install this into the ballast that came with my light and all because the cool tube has its own power soure and reflector as well...this is my first grow and im just trying to get things right.. these are the links to my light and the cool tube i plan to purchase..
LIGHT-http://cgi.ebay.com/ws/eBayISAPI.dllViewItem&ssPageName=STRK:MEWNX:IT&item=170255086201
COOL TUBE-http://htgsupply.com/viewproduct.asp?productID=48137
LIGHT-http://cgi.ebay.com/ws/eBayISAPI.dllViewItem&ssPageName=STRK:MEWNX:IT&item=170255086201
COOL TUBE-http://htgsupply.com/viewproduct.asp?productID=48137