from what i read if you watch what your plants are doing (either streaching leaves too large or too small internode spacing) you can actually tweak your ratio and add whatever portion of the spectrum is needed to get maximum growth.

remember once upon a time there was only MH lamps available for indoor growth and look at how the industry has evolved. the author of the above cited report is now working on his own LED matrix BUT what hes doing is making it adjustable so that you can "dial up" what your plants need.

i would imagine like in all such ventures and taking into consideration the need to simplify for marketing and economic reasons, soon someone will develop 2 or possibly 4 different matrix - 2 seedlings and veg stages and 2 flowering stages one for onset to develop more flowering sites and to swell up the buds in the final stage
Ziggy Stardust Reviewed by Ziggy Stardust on . LED grow lights... input please. Hello guys, I'm exchanging eMails with a representative from a LED company. I asked him if they could produce a custom light for growing, and here's what he told me: Our options are as follow: 940nm, 850nm, 660nm, 630nm, 610nm, 590nm 570nm, 530nm, 510nm, 470nm, 460nm, 400nm and a total of 64 LEDs in the bulb. Rating: 5