this is the very start of the future of growing. As LEDs become brighter, smaller, more efficient, and cheaper, we'll start to see HUGE results from extremely minimal power use. I have no idea when it'll replace current HID lighting, but I have no doubt that some time in the next 20 years it will, if not less.
Out of curiousity (sorry if it's already been asked) about how much money did all of those arrays run you, or how much would they cost someone else to buy?