DIY LED lights

[badpacket]

Gus, go to the Luxeon and Cree, Seoul websites and look at their technical suppport references. They have all the information you need.
The hard part if getting the constant current correct, and getting the proper heat sinks and LED's sinked to them.
Aside from that, its going to cost you $$ to experiment. If you have the excess cash, then go ahead, otherwise just spend $20 for a couple and play with them. If you can get them to run without burning up after a couple of weeks, then you are on your way.

While this is something that can be done by novices with electronics background, it is still subject to expensive error, and in many cases the expense is in reinventing the wheel that the manf's have already done.