resistance more than 10k.
Quoteresistance more than 10k.10k is too hign. Usually leds take 20 mA, may be more in impulse mode,so base on Ohm law resistor should be:5 V (power or digital pin) - 2 V (cross diode) / 20 mA = 150 Ohm.
On the plus side I got around 50 feet using the 10 Ohm.
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