LEDs are fun sneaky little devices that can and do waste a lot of current if you let them. Most projects I have seen use the standard current limiting resistor of 220 to 460 ohms. Try a 1000(1k) and look at your LED and see if you can see the difference in the light output. You can see a little diff...By: Geek07Boy
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Source: http://www.instructables.com/id/Arduino-LED-Exploration/
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