Lighting and ventilation quesitons please help

i understand that a
A 250 watt HID will illuminate a 2' x 2' garden.
A 400 watt HID will illuminate a 3' x 3' garden.
A 600 watt HID will illuminate a 4' x 4' garden.
A 1000 watt HID will illuminate a 5' x 5' garden.

So generally a plant needs atleast 3 ft. sq to maxamize growth iv been reading, so i can generally fit 4 plants dimond style under each light? and they would bearly overlap, i dont want to overcrowd i want to maxamise light here so givin that i am vegging and flowering all in the same room and using 6 lights, can i just get 3; 1000 watt MH and 3; 1000 watt HPS lights? would that work or what is my best option here, im not too shure on how many plants to grow under each liight withought overcrowding, help would be appreciated lol
 
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