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2. Blue light spectrum - Wikipedia

   en.wikipedia.org/wiki/Blue_light_spectrum

   The blue light spectrum is an essential part of the visible spectrum with wavelengths of about 400-480 nm. [1] Blue light is primarily generated by Light-Emitting Diodes (LED) lighting and digital screens, it has now become prevalent in the world around us. [2] LED lighting creates white light by combining blue light with other wavelengths ...

3. Do blue light glasses actually protect your eyes? Eye ... - AOL

   www.aol.com/news/blue-light-glasses-actually...

   Blue light glasses are used to filter out this artificial blue light from digital devices, says Maturi. The lenses of the glasses have filters that sellers claim can block or absorb the blue light ...

4. Biological effects of high-energy visible light - Wikipedia

   en.wikipedia.org/wiki/Biological_effects_of_high...

   Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.

5. f.lux - Wikipedia

   en.wikipedia.org/wiki/F.lux

   Website. justgetflux .com. f.lux (pronounced "flux") is a cross-platform computer program that adjusts a display's color temperature according to location and time of day, offering functional respite for the eyes. The program is designed to reduce eye strain during night-time use, helping to reduce disruption of sleep patterns.

6. Blue-light glasses don’t help with eye strain, major study says

   www.aol.com/news/blue-light-glasses-don-t...

   In addition, blue-light filtering lenses only filter between 10% and 25% of blue light from artificial devices such as computer screens, and that blue light is only “a thousandth of what we get ...

7. Wratten number - Wikipedia

   en.wikipedia.org/wiki/Wratten_number

   Wratten numbers are a labeling system for optical filters, usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter, but is arbitrary and does not encode any information (the 80A–80D are blue, the next filters in numerical order, 81A–81EF, are orange); letters almost always ...