Hi all,
I just came across this website, reefledlights.com today. There are many useful info about LED diying needs for newbies which include how to diy LED, Driver FAQ, Optics Evaluation, Color Balancing, Wiring Diagram, PAR comparison with optics vs no optics, soldering, troubleshooting....etc .
If you are going to diy your own LED lighting, this may be one of the good website to read and learn from... !