growing with led boards?

hi, i have read about growing using these led grow boards

http://satandcable.com/content/225-led-red-and-blue-hydroponic-light-grow-board

but how many of these would be needed per plant and how far from the plant would it need to be. they seem to be a lot cheaper to run and probably a bit safer as they wont heat up.

I asked my local hydroponic supply about led he does not carry them and does not suggest I use them, . I don't think they any good yet either. I seen 2foot H5HO, if your looking for an smarter investment.

prolly 4-5 per plant. just get 1 90W UFO per plant

save money, headaches and get a much higher yield with cheap ass HPS.