k, if you cant get two lamps, then you have a couple of options. 1) Get a Sun-argo HPS, it has an enhanced bleu spectrum so that it can do it all. Or 2) get a ballast that can use both HPS and MH, of called a conversion system. if you cant do that, i guess MH would work for both.
and get a clue, you might want to ask who you got the light from what kind of light it is.
DR. Science Reviewed by DR. Science on . Question about HPS and MH I know that MH bulbs has a blue frequency for vegging and HPS has a red frequency for blooming. But which will the a better bulb for the entire growth process? which will produce better yields when used during the whole growth process? What bulb is in this picture? MH or HPS? I think its MH cus the light is kinda blue. Rating: 5