What is blue light?

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The world is pulsing with electromagnetic energy. It travels around us, and even through us, in waves. The waves vary in length from longer radio waves, microwaves, infrared, and UV waves to the shorties of the electromagnetic spectrum: X-rays and gamma rays.

Most electromagnetic waves are invisible. But a small band of waves, known as visible light, can be detected by the human eye. Visible light waves vary in length from 380 nanometers (violet light) to 700 nanometers (red light).

The longer the wave, the less energy it transmits. Blue light has very short, high-energy waves. In fact, they’re only slightly longer and less powerful than ultraviolet (UV) waves (which are too short for people to see with the naked eye). Health experts have warned against the harmful effects of UV rays, which can damage your skin and your eyes. High-energy blue light waves are nearly as powerful.