I've looked at making the switch for awhile but honestly I'm not sold on LED's yet, and honestly some of that is from not having practical experience using LED's. Here is some of the things I looked at, comparing LED's to HPS single ended bulbs there is going to be much bigger difference then comparing LED's to DE HPS, I will bet as far as yield and quality goes DE and LED's are more on par with each other.
Growth rates, going by some of the grows I seen, and ones I seen on here (SSHZ) I believe DE HPS easily win's. From what I seen and understand, LED's could easily add a couple weeks to veg time and even add time to flower. basically making the power bill not so unbalanced.
And then price of fixtures, My PL-light DE's are about 550 each, and after testing a bunch I think there one of the best out there. A
Gavita LED light up here is like 2K+. I know there is cheaper but do they really compare to the
Gavita's?