I've only made a couple of LED growlights. To be honest I haven't been too impressed with the results so far so have left it to others, like you, to exeriment with the newer stuff. My growlights were 1W red and blue Luxeon stars, so I used wide angle optics to combine the colours as close to the source as possible so that I didn't have to increase the distance between plant and light.
Did you two do any experimentation with aux optics?
Av8tor1,
What plant are you going to experiment on?
The luxeon LED's are REALLY bright.