That sounds like an awfully crowded grow space with 8 plants in it no matter what lights you choose!
I thibk we are both confused bro lol after reading it again I think he has 2 1.2x1m rooms and plants 4 plants in each with 1 light in each. I originally thought there was 4 rooms lol. I think 3 lights could do it if you stagger so you perminantly have 1 light in each and a floater for bloom.