Well I started asking around about the same question and Rollin and several people said turn them both on. So I switched mine over as well, but am up at 28" in height. We can compare notes as they grow along! Around 50-60% RH is your goal in veg, and 40-50% in flower, those are the numbers I chase anyway. But, a lot of things I have read say a lot of people just aim at 50% all the way through to keep it more simple.