dual spectrum

Hi there people, I have done a couple of grows and am still a bit baffled by the bulbs you can get for flowering. I always veg my plants under a 400 hps dual specrtrum sunmaster and get good results, I know everyone says metal halide is best and im sure it is but i do fine with the hps. What I...

Currently I have two sets of the dual spectrum bulbs. I have heard of people using both spectrums at the same time, but I thought they were to be used at separate times, veg and flowering. Am I incorrect in this assumption? Also I have been looking into purchasing a HPS and MH setup in hopes...