IF the above is even close to be true, Then I can`t see LEDs even coming close to the Hids???
I`m not shooting down Leds, or Hids just so much Confusing data out here.
LED's are not intended to replace HID in instances you mention. LED shines where one does not have the ability or the space to exhaust all the HEAT a comparable HID produces.
You can throw one of these in a tiny closet just big enough for the light with minimal exhaust (for the plant to breathe) without all the extra fans and duct work.