Question about grow space and the amount of plants to grow, please look in

Is a 5x5x7 tent too small to do 12 plants under a 1000W HPS? They are all about 18" tall and will be put on 12/12 soon. what are the cons of doing this many plants being so close to each other? 5 gal pots. C02 during 12/12 @ 1500PPM.

Can anyone give me some advice pretty please?

Also can someone help calculate total watts per square foot? My iponic 600 tells me I have about 130 Watts per meter squared. Is this enough wattage for a 25ft space for 12 ladies? I know I should have around 40 per lady but i dont know how to calculate.