Some people get three pounds a light with 1000w.
I'm gonna guess that the ratio of people who get a pound a light vs people who get 3 pounds a light is about 1000 to 1
Been at this for 12 years and 1.5 a light was always a solid result with HPS which is somewhere around .65 grams per watt.
I hit .9 grams per watt on my last one and that was not a great crop so 1.2-1.3 really isn't a stretch for these lights.
Yes the initial cost is high but at double the efficiency and minimal cooling costs it takes a very short time to recover the startup costs.
For anyone actually concerned with heat generation or power consumption they are a clear choice.
I think the biggest issue right now with LED is that every man and his dog is jumping on the bandwagon of re-selling cheap junk so there's lots of horror stories.
The other issue is understanding LED's limitations.
LED's are very sensitive to heat and their life expectancy, which is normally 3-5 years drops to 3-5 months without proper thermal management.
LED's also have quite a limited range so to covering larger areas is best addressed by using several smaller panels as opposed to one larger panel. Best results I have seen to date were from a guy running 5 120watt (actual draw) panels. Seen decent results from growers running up to 300 watt panels but even at that size the efficiency seems to drop off a bit.
My personal opinon is that the max usable wattage for a panel is 200 watts for panels using 60 degree lens angles and 280 watts for panels running 90 degree lens angles.