How many watts? MH is better for vegging you can use it through the whole grow though same with High Pressure sodium. High pressure sodium is better for flowering though, if you can't afford both just pick one...it will do just fine. I bought a 2 way fixture that runs hps or mh seeing how you can't run both in the same fixture unless it says so, also don't run without a ballast it's a safety hazard. Hope this helps.