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  2. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    In Arkansas and Kentucky, civilian possession of a blue flashing light is prohibited by state law. Additionally, blue is the color used by law enforcement agencies. In California, all emergency vehicles just use red warning lights, with 1 steady red warning light facing forward.

  3. Glasses - Wikipedia

    en.wikipedia.org/wiki/Glasses

    Anaglyph 3D glasses have a different colored filter for each eye, typically red and blue or red and green. A polarized 3D system on the other hand uses polarized filters. Polarized 3D glasses allow for color 3D, while the red-blue lenses produce an image with distorted coloration. An active shutter 3D system uses electronic shutters.

  4. List of U.S. state colors - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_colors

    Jersey Blue Buff; Using the Cable color system developed by the Color Association of the United States, Jersey Blue was defined as Cable No. 70087; Buff was defined as Cable No. 65015. The Office of the Secretary of State of New Jersey gives the blue and buff color hexadecimal equivalents as #2484C6 and #E1B584, respectively. [26]

  5. Blue - Wikipedia

    en.wikipedia.org/wiki/Blue

    Blue is one of the three primary colours in the RYB colour model (traditional colour theory), as well as in the RGB (additive) colour model. [ 2] It lies between violet and cyan on the spectrum of visible light. The term blue generally describes colours perceived by humans observing light with a dominant wavelength that's between approximately ...

  6. 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.

  7. Vehicle registration plates of Arkansas - Wikipedia

    en.wikipedia.org/wiki/Vehicle_registration...

    The U.S. state of Arkansas first required its residents to register their motor vehicles and display license plates in 1911. Prior to 1911, plates were issued by cities. As of 2022, plates are issued by the Arkansas Department of Finance and Administration. Only rear plates have been required since 1944.

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