LED Circuitry tutorial: how to hook up LEDs. Text and illustrated instructions for setting up a circuit, what is series and parallel circuits, how to determine resistors.
www.theledlight.com/ledcircuits.html
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The LED Museum. A site devoted to testing & reviews of LEDs & LED flashlights in all common chemistries. Includes test target illumination photos of many LED samples, LED museum, and LED flashlight abuse.