That study is worthless - Why would you put a 400 Watt HPS Lamp ~ 6 feet away from the tops? 6 FEET?

Has ANYONE ever gotten an LED setup to (through) flower and compared the (only relevant calculation for us) grams/watt? I'm still waiting for that one..
Tokudai Reviewed by Tokudai 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