In any case, do you need a high intensity?
So from this we can conclude that the Nano2 and Nano3.3 must have used different LEDs right? (Or they might have used the same LED but in which case they are more dim on the Nano3.3)
No not at all. I am more concerned by the LED's potentially being too bright.
I just want to be able to tell if the LED is lit or not when looking at it in normal room lighting without it blinding me It just serves as an indicator LED like on the Arduino. Nothing functional besides that. Any idea of a mcd value I should be aiming for?
Let's move on to RP1A and RP1B. Why are there 1K ohm resistors on these Rx and Tx lines to the FT232RL? I couldn't find them mentioned in the ATMega328P data sheet and in the FT232RL data sheet there is some mention of a 1.5K ohm resistor in relation to pin 15 and 16 in section 3.2 on page 7. However I don't think this is related to RP1A and RP1B on the schematic. My question: Why did someone (smarter and with more knowledge than me) decide to put these 1K ohm resistors there?