Thanks, I was wondering about that part. In that case, the base number should be:
Resistance (ohms) = 2.4v / 0.275 amps (1 milliamp = 1000th of an amp) = 8.73
Since I couldn't find anything but 20 ohm and 100 ohm I guess 20 ohm is still the way to go. It seems to be working well.
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