I can't even think of a dream cab setup off the top of my head........... 1 x 4 square foot box with 10 x 23 watt cfls putting out 1,600 lumens each ~ 16,000 lumens / 4 square feet = 4,000 lumens per square feet 230 watts/ hr. Throw in a strong axial fan (sold at hydro shops) connected to dryer ducting on the floor of the cab to quickly pull in fresh air. Point fan toward pots on the floor and have an outlet hole cut on opposite side as the inlet hole, near the ceiling, to force the new air in at the bottom and old/hot air out at the top. I think the strong/fast fan as the inlet prevents any pests from entering the cab. My axial fan is 16 watts/hr. So, if using soil or soil less mix as media, 6 large or 8 medium plants can be bloomed at a spectrum efficient light output of 4,000 lumens/ square foot, with low heat emission, and using 246 watts/hr (including fan). Talk about some cheap marijuana....... yet cannibis cup quality