really 3'/3'/3 isnt that bad of an area if your only doing 1 i find. mine is 2'/2'/4' tall i used t5s and cfl for the whole veg time. then added a hps like 4 weeks into flowering. i think cfls did a great job. hps in a 3'/3'/3' might get 2 hot. i would stick to cfls if i was you. get some bigger...