Be carefuly with the Blue LED's. They are BRIGHT. Don't put the in your case if you sleep in the same room, Also don't put the White LED's in your case either. It'll be like sleeping with a Mag-light shining at you.
The Blue and White LED's work great in Flashlights. A friend took a white LED and put it into a Mag-Light (the 2-AA model) and he hooked it up to a Amp-meter and according to the readings the White LED with a standard battery will last almost 15 years without having to be changed.