There's a calculator on the following page.
Light Emitting Diodes (LED)
The value isn't critical to the LED. Lower value drives more current through it and can make it run hot and die an early death. On 12v a 1k resistor is generally perfectly fine for red, green, blue and amber LEDs.
Light Emitting Diodes (LED)
The value isn't critical to the LED. Lower value drives more current through it and can make it run hot and die an early death. On 12v a 1k resistor is generally perfectly fine for red, green, blue and amber LEDs.
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