I have a 2x2 space and can either run 2 autos or 1 photo strain in that area... the autos in 1.5 gallon pots or a photo strain in my prefered container size which is 3.5 gallons.. right now I have 1 photo strain going in there.. its not a tent either its a cardboard box ive made into a tent in a closet.
I have a 180 watt full spectrum ufo and 5 cfl's ... 2 150 watt cfls and 3 23 watters... I use all that for just 1 plant and its perfect or i could do 2 autos... I'm looking right at 13,650 lumens.
Ohhhh yea.. the ACTUAL wattage of my UFO which is the number you really wanna look at is 121 watts (been tested with an APC battery backup for a computer , plug in light to it and tells you what its drawing from the wall)
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with that 300 watt mars hydro I would do 3 autos or 2 photo strains and I wouldnt grow them super huge or anything.
Here is what 5 cfl's (2 of them being the good 150 watt cfls) and a 180 watt ufo can do.. as I said though.. I wouldnt dare try 2 photo strains.. only 2 autos in smaller pots..
here is my setup.. its ghetto .. yes I know.. I'm poor.. but I can still grow outstanding funk.
Those pics are from today.. today is day 30 of flowering
strain is northern lights X big bud and its from world of seeds.