careful who you take advice from...most of these people have agendas
Seems like some on each side of the debate have an agenda.
I just added an LED to my grow after growing under solely HID for 20+ years. I have no agenda, i dont represent any company that sells lights or any kind of grow gear. I only post what I see/know from my own personal experience.
In my opinion HID is still superior to LED, though I think that will change in the future. I can say without a doubt that LED lighting does serve a purpose if you are worried about electricity use (inline fans, ducting etc.), thats why I added an LED to my flowering chamber.
The LED raised my flowering room temp 2 degrees, I was able to keep my ventilation as it was; no need for more fans or ducting. I will say that my plants do seem to really like the combination of HPS and LED lighting together. I had a 150 HPS alongside the 400 HPS until I bought the LED, the LED is having much more of an impact than the 150 watt HPS and none of the added heat to deal with.
It seems to me a combination of HID and LED is real beneficial..