Hi, so at 120 cm height and with lamps plus filter etc. inside, and your pots being, let's say, 20 to 30 cm tall, you don't have much space for them to grow big. According to the supplier, they can reach 150 cm. In such a tent, I would either go for smaller strains or continue applying LST. For example, I often top the autoflowering strains so they develop more main colas and achieve good yields.