i don't at all agree. the plants i've worked with hands down prefer the LED over the HPS. I've used both alone and both together, and just don't see how anyone still believes HPS has anything on LED. Not just for yield per watt but also because the frostiness and potency is way better with the LED. I haven't completely replaced my HPS/MH, but am working diligently on doing so because 3 600w of HID isn't even coming close to what I'm doing in a 900w LED chamber. Same strains, same feedings just the exhaust fans are different. In my 1800w room I have to pretty much keep close to 400cfms running almost constantly but in my LED room it's a 200 cfm that kicks on every 3 hours for just 15 minutes to lower the humidity. My first grows with LED failed to impress me because I failed to make the proper adjustments. There's a learning curve to LED. I think anyone who isn't an idiot can learn to make the adjustments to use LED way more effectively than HID but anyways I will be replacing all my HPS because frankly I think they belong in a museum.