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Why is the sky blue? It’s one of those common questions that surprisingly few people know the answer to, and that answer is blue light. This is due to the mind-boggling amount of time spent using these devices coupled with the close proximity to the screens. Despite that, these devices have many people worried about the possible long-term effects of blue light. The quantity of blue light emitted by these devices is a bare fraction of that emitted by the sun. These include fluorescent and LED artificial lighting, as well as the screens of all your digital devices. In addition to the sun, there are also numerous manmade sources of blue light. As a result, simply being outdoors during the daytime gets you the most exposure to blue light. The main source of blue light (and all light in general) is the sun. Here are some key points to note about blue light: Blue light is all around you Just like its close neighbour in the electromagnetic spectrum (UV light), blue light has both benefits and dangers. Like many things, UV rays in moderation can have benefits like the production of vitamin D.
#Beyond blue uv blocker skin#
However, too much exposure to UV results in sunburns and can even lead to skin cancer. As a matter of fact, the bulbs in tanning booths emit controlled amounts of UV radiation for this exact reason. UV rays have higher energy than visible light and are therefore able to significantly affect the skin. Fittingly, the invisible electromagnetic rays just beyond them are called ultraviolet (UV) rays. On the blue end of the spectrum, rays with the highest amount of energy are sometimes called blue-violet or violet light. These are invisible waves that pass along heat. Just beyond the red end of the spectrum of visible light are the infrared rays. That is roughly a third of all visible light. Blue light or high-energy visible (HEV) light is essentially light ranging from 380 to 500 nm. In the entire electromagnetic spectrum, visible light falls between the wavelengths of 380 nm and 700 nm. The blue light on the other end of the spectrum has shorter wavelengths and more energy. As a result, red light on one end of the light spectrum has longer wavelengths and therefore, less energy. Without delving too deep into complicated physics, there’s an inverse relationship between wavelength and energy in waves. These are all determined by their wavelengths and the energy carried by the individual rays.
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Visible light contains red, orange, yellow, green and blue rays and their many shades. It’s composed of a range of different colours that contain different amounts of energy. However, what may surprise you is that the visible white light emitted by the sun isn’t a single entity. You probably already know that sunlight contains white light as well as the infamous invisible ultraviolet rays. Just what is a blue light filter? The sun, indoor lights, your computer, phone, and other digital devices – all these expose you to different light rays.