voltage - What resistor to use with this RGB LED? - Electrical Engineering Stack Exchange
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Guide to LEDs and resistors
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Amazon.com: 5mm 6v Pre-Wired Red LED - Ultra Bright (3v, 4v, 5v, 6v) (Pack of 5) : Industrial & Scientific
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Guide to LEDs and resistors
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50 x 12v 5mm LED Light Red Ultra Bright Internal Resistor 5v-15v 9v 6v 14v 7 no | eBay
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