If you wire the CC LED to either the Deep Sleep pad or the Accent LED pad on the NB you really don't need a resistor since both of those pads only put out 3.3v. The FV of the LED is so close the source voltage of the pad you really have nothing to worry about. Only if you go off of the main power circuit do you really need to worry. There are really almost a dozen of different ways to wire in CC LED's. You can even do more than one LED. You can wire them to turn on as soon as the board is powered, or only when the blade turns on, you can wire in two so that the CC has FoC as well, or you can even do three LED's; One that comes on when the board is powered (Power indicator LED), one that comes on with the main blade and flickers, and one that is wired to the FoC circuit. It's really your decision.
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