There are LED's that shine in a wider angle, thus allowing you to get them close to the plant. You could get them close to the plant with non wide angle LED's too, you would just have to use a more reasonable amount. This is extremely necessary as the intensity greatly decreases as you move them back.

I agree about getting some numbers down. LEDs for weed farming is such a new concept it hasn't been thoroughly studied and documented. Ziggy, wanna be the first? I wish I could but I just don't have the time, darn it. I got a few numbers, but not enough for a real grow.

I still am waiting to see an LED grow that produced buds of any significance. I have no doubt that a person could get some decent bud from LED lighting. In general people are going about it wrong, and they refuse to spend any money to boot. At this point the initial set up would be expensive as hell to get one plant to bud nicely, but it can be done. Due to the life expectancy and low power draw, very soon they will become viable. Perhaps even today.
Opie Yutts Reviewed by Opie Yutts 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