my 15Lx10W Grow room question.

My question is i want to grow the whole space all at once in comparison to having a veg and flower room.

ive found some dual mh hps lights and i plan on maxing out 1 or 2 grows in this space before moving it to a better location. can anyone tell me how many lights i need. im thinking my grow my contain about 50 plants

im taking all advice and concerns

It all depends on which size you want to go for before blooming. Which strain you choose - whether it's indica or sativa dominant - and how much space you have available. If you want 50 plants you have to balance size of the plants, grow room, and how many plants will fit under one light.