I don't have any experience with installing LED's on bikes but can offer one suggestion that might come in handy if they're too bright, which happens often when I'm dealing with audio equipment, especially with the blue LED's.
Fingernail polish works great to manage the intensity of LED's and even to change the color slightly. A little deep-red polish applied to an over-bright blue LED dims it and makes it a much more pleasant bluish-purple color. There's also gray polish to dim the light without changing the color, useful for red and green ones. Just dab on a coat, let it dry thoroughly and test it. If it's not enough, put on another coat but ONLY after the first coat is completely dry. If it's too much it comes off easily with, what else, fingernail polish remover, or acetone.