The full visible light spectrum is between 380 and 780nm. Blue light is visible light with a wave length between 415 and 455 nanometers (nm). This type of light is seen blue in color but also can be present when it is seen white or other colors. Blue light is more damaging because it has more energy per photon of light than other colors in the visible spectrum, affecting our bodies on a cellular level, but especially our eyes. Over-exposure to blue light can disrupt our circadian rhythms (when we wake up and fall asleep), and it affects our bodies in a way that can have negative health effects.