Im sorry. Forgot not everyone uses centimeters. Its cm. Probably just one. Or at least start blooming it in this room and then move it to a bigger one. The idea is to be able to get a rotation in plants between 3 rooms, so that i will be able to harvest one plant, as often as possible. The idea is small CFL room for veg -> slightly bigger 250w HPS room -> then finish in bigger 400w HPS. Then be moving up a plant every few weeks. Im slightly stoned, but i hope this makes sense.