Blue light is a prime example of how harmful too much of a good thing can be. Our bodies need the blue light sunlight naturally radiates. However, after the sun sets, artificial lights continue to illuminate our homes and computer screens, and constant exposure to blue light is producing dark consequences for our health. Electricity and technology extend waking hours to around the clock. Studies show blue light from electronic devices is affecting vision, sleep, and mental health and continue to expose its dangers.


1. 1. What is Blue Light?

Sunlight or white light contains red, orange, yellow, green, blue, indigo, and violet light, as well as infinite shades of each. Every color has a unique wavelength and energy or electromagnetic radiation. Light rays on the red end of the visible light spectrum have longer wavelengths and emanate less energy. On the opposite end, blue light rays have shorter wavelengths and radiate more energy. When the light rays on the blue end of the light spectrum bounce on water and air molecules in the atmosphere, they scatter more easily than other light rays with longer wavelengths. This is why we see a cloudless sky as blue. About one-third of all visible light is blue light.

blue lights PeterHermesFurian / Getty Images

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