Basically say you have 4 1000 watt ballasts. You can plug those into the flip box. You plug 8 reflectors in the flipbox. 4 lights can run at a time. So if your in flower you can have 2 seperate flowering rooms. Run 1 room with 4 lights on 12/12. When those lights shut off the flipbox switches to operate the other 4 lights in the other room. Hope that made sense. I just smoked a big bowl of some hash I made from some trim. It turned out amazing.