Would there be much difference in heat between a 600W Dimmable set at 250W and a regular 250W bulb in a 6" cool tube?
I was looking at a http://www.ebay.com/itm/600-W-400-W-250-W-Digital-Dimmable-Ballast-Grow-Light-HPS-MH-YOYO-COOL-TUBE-/320789745895?pt=LH_DefaultDomain_0&hash=item4ab08f10e7
although it might be a better/safer bet to spend a few bucks more and get something name brand.
I was looking at a http://www.ebay.com/itm/600-W-400-W-250-W-Digital-Dimmable-Ballast-Grow-Light-HPS-MH-YOYO-COOL-TUBE-/320789745895?pt=LH_DefaultDomain_0&hash=item4ab08f10e7
although it might be a better/safer bet to spend a few bucks more and get something name brand.