All I know the stuff I grow under LED is insanely better then the stuff I grow under HPS. ( Even same strains )
Sure I get a little less weight and size , but the quality more then makes up for it. By a long shot.
I grow really good weed using HPS but LED is a whole different level.
It's stickier ( super glue sticky ) and more resinous, buds are tight and just plain brick hard, taste is way tastier, and the high is almost psychedelic.
Wish I had discovered LED years ago.
I plan on selling my last HPS and MH set ups soon.
Just the cooling hassle alone is worth the extra money, used to have massive intakes and exhausts, ducts running everywhere, having to run an AC for cooling, having to fight RH as the HIDs dries out the air too much...now it's a few oscillating fans. Electric bill is less the half.
And you don't need to jam the plants up close to the light, they may not look bright as HID, but they are just as effective. My lights have decent foot prints.
I'm extremely happy with my LEDS, quiet, cool...and weed is something else crazy good.