Blue light is a color in the visible light spectrum that can be seen by human eyes. Because blue light is a short wavelength, it produces higher amounts of energy. Today blue light can be found everywhere. Once, the only source of blue light was from the sun. Now, by way of digital screens (found on TVs, smartphones, computers, laptops, tablets and gaming systems), electronic devices, LED and fluorescent lighting we are virtually surrounded by it throughout the day and night.