I realized the other night, when I got a call on my cell phone long after I had gone to bed, that despite the fact that having bright blue lights everywhere in your cell phone may look cool, it is no good for the eyes.
Blue light is very close to the top of the visible light spectrum. It has a short wavelength, and high energy. Just what you don’t want when looking at something in the dark, because it ruins your night vision very quickly. Red light, being at the bottom of the spectrum, has a longer wavelength, and is lower in energy. Maybe we should convince cell phone makers to use red lights in the cell phones?