Im plannin on growing two plants in a stealth box made of plywood and then Im covering it in a cardboard box accordingly. Im plannin on only using this box for one month until april. Then putting the plants in a room way in the back of my house that gets too cold at night to grow them in there now. Im gonna use some T5's aint bought yet cause dont know how many bulbs I should get on the fixture.This my first time at growin bud also . That in mind what size should this box be? TY