Both of my HPS and MH bulbs are 250 watts im sure that should be plenty for two to three plants........I have my plants and little planters right now approx 6 to 7 inches in diameter and about the same deep . I just didnt know how close i should put them to the light? I pretty much knew to use the MH for veg stage but have heard people say they used a HPS through there whole growth of there plants> Again I appreciate all the help