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LED Resistor Calculator

LED Specifications
Color   LED  SIZE   VDC    mA  View Angle  MCD
Blue  5mm LED - Clear 3.0 30mA 30 Deg 2500
Green  5mm LED - Clear 3.5 30mA 30 Deg 2500
Red  5mm LED - Clear 2.25 30mA 32 Deg 8000
Yellow  5mm LED - Clear 2.0 30mA 30 Deg 4000
White  5mm LED - Clear 3.1 25mA 30 Deg 5000

 RGB
  5mm LED - Clear

3.1
  25-30mA

 30 Deg

  800


Current limiting series resistor formula:
vIN - vLED / 30 milliamp = series current limiting resistor.

((5V - 3V) / 0.030) = 100 Ohm series resistor for a 5V supply.

((6V - 3V) / 0.030) = 100 Ohm series resistor for a 6V supply.

((9V - 3V) / 0.030) = 200 Ohm series resistor for a 9V supply.

((12V - 3V) / 0.030) = 300 Ohm series resistor for a 12V supply.

Change the mA to 0.020 if using a 20mA LED




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