I read through this thread and I have yet to see any solid reasons why you would WANT to use L.E.D.'s??? :wtf: Anybody see any killer L.E.D. grows? They are inefficient, dim, and have to be almost touching the plant to have any real effect. Sure you could buy $3000 worth of L.E.D.'s and grow a plant or two, but whats the point? Thats a huge waste of money, and money = energy. I think the most efficient setup would use ether a Dual 600w Digital ballast HPS or a 1000w Digital ballast HPS.

I posted this in the an other L.E.D. thread: "I really don't think LED's are going anywhere, they are not even more efficient then a CFL for Lumen output per Watt used. Low pressure sodium would be the most efficient, but not for growing. So high pressure sodium would be the next step down in a efficient light source. Maybe sulfur plasma lights will get better/cheaper soon??

Here is some Lumen's per Watt:
Candle : ~.3 (Lm/W)
Incandescent : 20~24 (Lm/W)
Halogen : 30~36 (Lm/W)
L.E.D.'s : 26-70 (Lm/W) The high of 70 is for prototype white L.E.D.'s
CFL's : 45-105 (Lm/W)
Sulfur Plasma : ~100 (Lm/W) light output VERY close to sunlight, better than any other artificial light source.
Metal halide : 80~125 (Lm/W)
High pressure sodium lamps : 140-160 (Lm/W)
Low pressure sodium lamps : 180-200 (Lm/W)"