8 years ago I started switching to LED's. I been though some pretty shady units. all the high end LED's work, but I think we will see a paradigm shift to mostly white light COB's 3000-5000k.
I think the industry is going that way, its cheaper, more apt to be modular, and the DYI plays right in to what growers like to do, just a thread ago I saw a bottle of dawn dish soap holding the window liner. we fuck with shit its what we do, I think LED's naturally lead themselves to that trait.
everyone has their own voodoo, I run pair of red panel LED's for the last 30 minutes of each flower day. so we know LED's are not going anywhere, they are only getting better. its been a minute since I burned an HPS I cant think of any significant changes in technology since the 80's ballasts have gotten a whole lot more reliable.
if it keeps my bill under $500 bucks ill ride the LED train....until something better comes along.
if you have ever stolen a street pole light to grow with, you might appreciate LED's a bit more lol.