I have been looking at the Spectra LED 450 2011 model from growledhydro.com, its been proven to work by documented grows. Unfortunately they refuse to disclose the exact nanometers of light. They do boast using 9 differn't colors in their LED array and 12 seperate isolated wavelengths.
http://www.earthshineledlights.com/
There is a local company that produces LED units, but I cant find much history of use with these units.
300 1 Watt 350 mA LEDs, Red (620-630 nm), Blue (460-470 nm) and Orange (600-615 nm). AC 110V/230V±10%V, 7000 lm, 50,000 hr lifetime.