Which resistor to use with LED?

Basics: Picking Resistors for LEDs
Power Supply VoltageLED ColorResistor (rounded)
5 VRed, Yellow, or Yellow-Green150 Ω
5 VRed, Yellow, or Yellow-Green56 Ω
9 VRed, Yellow, or Yellow-Green75 Ω
9 VBlue, Green, White, or UV100 Ω

Updated: 21st October 2019

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