Lighting...!!!

hi guys...straight up question!!!!
Got a room that 3x4 meters in diameter and have 12 plants in there...
How many 600watt hps lights do I need for that room for the plants thrive perfectly n not starve of light n also not have heat issues..?

10 would give you little under 50 watts per sq. ft.

@brimck325
How many watts shud there be per sq ft for the plants to thrive nicely?

most say 50...

Interesting, I have 2x exodus cheese in second week of flower, they aren't 25litre each and are in a space 1mx1m, they are under 4x25w 2700k cfl and 2x14w t5 7500k, will this be enough? I have no picture to hand but will put more on later, thanks in advance