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http://led.linear1.org/why-do-i-need-a-resistor-with-an-led/ Why do you need a resistor with an LED? The short answer: to limit the current in the LED to a safe value. The long answer: LEDs are semiconductors, diodes in particular.

LED center » Why do I need a resistor with an LED?

Super Bright LEDs - LED Information

http://www.superbrightleds.com/cgi-bin/store/index.cgi?action=DispPage&Page2Disp=%2Fled_info.htm CAUTION: LEDS are static sensitive devices. Observe static sensitivity handling precautions, such as wearing a grounded wrist strap when handling Please note that LED components are not considered bulbs, an LED bulb is a complete system consisting of LEDs, LED drivers or resistors, and a housing.