how many plants and lamps in my space???

ive got 2.5mx3.5m space to grow inn so how many plants would you say i could do with how many 600w lamps above them? thanks in advance

2 600Watt lights would do great, but the number of plants depends on the size you want. If you went small you could put dozens and dozens. The longer you veg, the fewer plants you wil be able to put in there.

i was thinking 20 plants and roughly 8 lamps veg for aroung 3-4 weeks

Heat control with sealed hoods would probibly be needed. 1 600 watt covers 1 square meter, well. If you can control your enviroment go for it.