Im using metal halide start to finish 400w setup. check my grow journal in my signature if you want to see how my plants look. the last photos are 11 days flowering posted yesterday. it should give you some idea of what a MH can grow with the right other aspects. Ive heard that MH all the way through produces dense buds, but I dont have an experience with this and im sure you can get dense buds even with HPS if you do the right things.