my brothers sisters cousins uncles grandmas neighbour knows a guy.. that has had no problems getting 1.5- 2 lbs per 1000w hps , with plants that were veged under only hps, personally .. i know mh are better for veg.. but certainly not essential, especially for sogs that only have a short veg.

Same goes for mh for flowering .. swim has seen side by side rooms .. one room 2 k mhs .. one room hps ... same strain .. with little difference in yield.