There are as many different growing styles as there are growers. For me I have a 36"L x 20"W x 60"H so ours are similar but I only grow in soil. IMHO my tent is to small for more than 2 plants unless they are auto strains then maybe 6. So, I only grow 2 plants per cycle. I harvest 3 times a year...but I only need to supply myself and the yields are more than sufficient. I have a journal going if you are interested...not a plug or a thread jacking attempt! LOL!!
I use a 400 w HID with a cool tube and booster fan...the tent is to small to have that much heat and not be able too cool it. My gurlz are only about 1.5' below the light and the glass light casing is cool to the touch. I reviewed and researched for quite a while this time on light source. I spent weeks reading about LED, T5, cfl, and HID. My conclusion was that the available store bought products are way over sold and way under par. I am not handy so I did not want to DIY. T5 seemed a much better idea but with the size of my grow area I would need two 2' fixtures to get the footprint I would want. So, not really enough room for my comfort. So, I went with HID.
But that is my set up and you need to set your own grow up to be fully happy with it. So poke around the forums...tons of great info.
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P.S. I just saw your last post ...I have 2 gurlz in 5 gallon grow bags
Good Luck and Great Growz!