So I want to make an LED puck to slide into my Vader's Vault protector with CFX and neopixel so that I can do some hard dueling with it. The first problem is that I don't know how much space is available in the blade cavity (I'll cross that bridge when I actually get the saber) but my real big question is what power output do I have to accommodate for with resistors when putting this together?

I've got the actual build of the puck figured out (including flash on clash) but I have no clue what kind of power in dealing with.