Quoted from StylesBitchly:
Remember to use warm white lights if under a colored insert if you want to maintain accurate insert color. Also be sure to use warm white frosted above play field if it is really exposed to your eyes. Cool white is hard on my eyes unless under an insert or hidden from direct view. I also recommend using warm white flashers (if you’re going with led flashers you need to remove warming resistors). Warm white looks like incandescent bulbs. Of course blue frosted GI looks great under blue plastics and red and blue leds look great under same color inserts. Comet is good! You will def get ghosting if not using a led controller, so if not, get non ghosting leds for all cpu controlled lights. You have to decide before dropping the cash.
I agree with most of this but if your blue arrow inserts are faded like many are on F14 some blue LEDs will bring it right back to life.