Im a 1000w Halide 5500k-6000k kind of guy myself. No doubt, HPS will produce more, but there is mounting evidence heavy Blue during flowering, produces more varied chemical profiles, and more varied plant morphology.
Hotrilux has advertised this for year with their 5500k Hortilux Blue. It has also been used for medical research, because of this.
I also kind of digress that LED, are more efficient.
One Question is, how can a light be more efficient, for producing the fullest spectrum possible, that is like the sun, and basically omit the Invisible Spectrum, when 55%, of the Suns Energy, comes from Invisible spectrum? I agree LED has a better overall foot print. But a Hortilux Blue/5500k, and the MMS 1000w Have a spectrum of 280nm-2000+nm, and the same K rating as the sun, at midday.
Also agree both work, and if one lives in a hot climate, and struggle with heat? LED ARE MORE LOGICAL.
What one can do to supply heavier Blue with LED, would be to use ether a Solacure 10,000k UVA/B lamp(s), and a couple of Reptile Infrared Lamps. One need not run the Solacure more than 4 hours per day, or less depending on height from canopy. May not need to run the infrared more than 8-10 hours.