And now for some more goodness!

Here is the second part:  LED basics

Part one:

Lighting Tutorial: LED basics part 1

And the second part:

Lighting tutorial: LED basics part 2

Here is the LED wizard site:

http://led.linear1.org/led.wiz

And the site with the LED voltage charts:

http://www.kpsec.freeuk.com/components/led.htm

Enjoy!!