Come help me grow

I have virtual sun 4x8x7" grow tent I have 2 600 watt hortilux bulbs 2 sunsystem 6"air cooled hoods a vortex inline fan cooling the lights my temps stay at 75* with the lights on and 64* with the lights off . I'm growing in ff soil 12white widow in 2 gal pots using there nuts line . I put 12 under one 600 April 1st at 16" (clones) today is April 16th and there 24" (even canopy) I keep the light 12" from canopy with no heat issues & the plants seem to thrive (is this to many plants?) I have 8 more I'm vegging to put under the other 600 because I want to do a perpetual grow ... So I want to see what will yield better 8 or 12 plant ... Do you guys think the 12 will yield decent ? Should I move the light up some or no? Please give me your inputs & thoughts . I am fairly new to this so please my garden is your garden lets grow !
Prayers go out to the people of Boston !

Theoretically, grams of product are directly proportional to light intercepted and converted to plant tissue (bud). In actuality (fact) you get to the point of diminishing returns on numbers of plants increasing your harvest weight. i.e. better to have 4 plants with some breathing room than 12 plants jammed in tight. Assuming you grow the 4 to a wide footprint.

So 4 plants say lst would be more effective you think ? I plane on harvesting every 35 days so please explain how to fill foot print effectivly becuase if given enough info i will try it and post the grow