Im not really sure but they look mostly the same; the Cool Tube (High Tech Garden Supply) has external reflectors to focus the light more so it seems on par with the Cool Sun 6" (High Tech Garden Supply), but i would go with the Easy Cool 6 over the cool tube mainly because of ease of bulb replacement. Heck, what do I know, I'm stuck with a crappy Lightwing reflector atm... :wtf: