Does the NB3 always supply 3.7 to the led?

[Gorth]

When reading the manual, I noticed an option to change the voltage supplied to the led, does this mean the board will always supply the same voltage (3.7) or is it just whatever the battery supplies. I know 18650 batteries can go up to 4.1 volts and am wondering if I should use 3.7 volts or 4.1 volts for resistor calculatios

[CET]

Use 3.7v for your calculations.

[NanoRex]

The option does not change the voltage supplied to the LEDs. It changes the amount of current that is given to the LED on average over a given amount of time using PWM.

[sgmtino]

when using a nb v3 do you need to use a resistor for the led module or will it be ok with using 3.7 volt batteries

[Forgetful Jedi Knight]

You need a resistor.

[Nirraven]

Have someone measured out the LED forward voltage from the NB v3.0?
Is it the same voltage as the battery or handle the NB to 3.7? I think this should be importand to the resistor we use.