5-10 plants is how I'd use that space, with a really short veg time.
You'll have to finish around 3ft or shorter, which shouldn't be too hard.
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Keep in mind that 1200W over 11sqft gives you 109W/sqft which imo is overkill. Two 400W lamps would give you 73W/sqft which is still overkill, especially for plants that will be under 3 feet.
One of those 600W lamps would put you at 55W/sqft which is pretty damn good lighting.
I've always recommended that people aim for a canopy coverage of between 40-60W/sqft.
Well I have a 2ft deep x 5ft 1/2 wide x 5ft 1/2 tall and two 600watt lights how many plants need advice asap waiting to re pot but don't no how many to repot?
Advice largely helped