Right now, we are working with high power LED and no, they are not cheap. its not so much the leds are expensive (which they are), but also we our heatsinks/drivers add the majority of the price. That's what we're working hard on reducing the price of .

Our company tends to provide few high power leds rather than many many low watt leds, because it improves stability.

Maybe this would be a better question: What's wrong with current led grow lights like procyon and lightblaze 400? do you guys tend to build your own or buy preassembled ones like these?

Thanks!