i recently bought a sun system 7 800 watt model.: Sunlight Supply - horticulture and aquarium lighting systems :. Website and was wondering what size cab would be the max for this?for example i know the recomended square footage for a 400w is 4x4 so would there be any difference with this?since its running a 400w mh and a 400w hps would it still be 4x4 or would it be larger?also would it increase the size if i used a conversion bulb or 3k mh bulb?or since both bulbs are in one reflector does it not make a difference?im just trying to figure out if i should keep this or sell it and buy a 600w system.