Depends on what your plans are for the future... I imagine you are looking at trying to reach the magical 1g per watt.... It is not an easy thing to do, and takes a few harvests to learn everything. Anyway, yeah, you will get muich better results with a 250-400HPS. I don't want to estimate, but you may break the 50-75g mark dry... Again 2-3 oz from one plant is not easy....