I'm sure most people reading this already know about how to use resistors with LEDs. I bought a cheap bag of assorted resistors without data sheets to know their voltage drop, so I searched the internet with duckduckgo to find a handy site that has some good guesses for the normal values there so I can get on with specing me resistors. I put it in a quick spreadsheet, and here are the values I got initially:

I will rummage through my resistors to get close to those and see if I'm happy with the brightness. My target current seems low enough that I can make some pretty bad mistakes here and not worry about it.