not if you have a dual ballast. But you could veg fine with sodium if you wanted to. but since you have a dual and an interest in getting another bulb, go for it.
polishpollack Reviewed by polishpollack on . when to switch to hps I have been doing my research and from what I found, the general consensus is to wait until the 12/12 stretch is over which can be anywhere from 2-3 weeks. I'm on day 11 of 12/12 and they are growing. Is my research correct, I don't want to wait too long. I only have one ballast our I would do both. How did you know it was time to switch? Rating: 5