I can't enter the Mars Hydro comp, I'm too much of a pedant, to be able to answer the question!
It all depends on how you plant/grow your plants!
Stunted grows tiny plants in tiny pots.
He could plant/grow tons of plants in a tent.
I dwarf my plants so they fit in small spaces.
All bud, no bones.
The question would be better put "how many average sized plants can be
"grown" in the space.
I could
"plant" hundreds of seeds in a 2' x 2' space, just not grow them to the end of their life cycle!
I could grow 4 plants to maturity in 2' x 2' or just one large one in a large pot!
Too many variables for me to give the right answer!
I have too many lights and have a new one coming soon *next couple of days) and I'm just about to build another COB lol.
The new light and the one I'm building are for small places, where my other lights won't fit but will be used in one of my 2' x 2' tents!
Heat sink not in the pic, as it is in a box somewhere!