You can do more than one in a pot. One grower on here, I forget who, grew a serious tent full with four plants in one 10-15 gallon pot. He put dividers in it to separate the roots into four quadrants, and it worked well. As I recall, he absolutely plugged a 2x2 with his four plants, and got about a pound of bud from the grow.
If you are interested in a cheap and effective LED for a 2x2, you can use screw in bulbs to make up a 9 bulb array with ~135 watts from the wall, which is ~34 watts/ square foot. Here is my current Northern Lights under that setup:
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The above pic was at Day 69.
Here she is a few days ago at Day 81:
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She will produce quite a bit of nice bud. Total cost for the light was roughly $60 Cdn, not including the aluminum base or wire which I had hanging around. The base could be made of plywood scrap, and the wire could be made from any old extension cords you have hanging around. I had the hangers already, but if you want to avoid cost, you could just use some cord and tie it as required to get your height adjustment.
You could up the power easily by making a 4x3 array.
Just a thought if you are into a bit of diy wiring.
Good luck with it.