htgs hoods are cheap garbage. for that price you might as well buy a quality one. i bought a hydrofarm aircooled xtrasun with cord for $10 cheaper than the more expensive one you linked. if you have hydrofarm or a quality hood next to those hgts hoods you can tell hgts isnt constructed good. everyone thinks they got good prices but if you look around you can find quality equipment, it may be 10-20$ more but you get quality shit. i had a htgs aircooled hood and it was suppose to be sealed but had air leaks and the reflector inside discolored...

HYDROFARM XTRASUN 6" REFLECTOR AIR COOLED - eBay (item 400086134442 end time Mar-17-10 17:25:37 PDT)