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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. Emergency vehicle equipment in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle...

    Emergency vehicle equipment is used in the United Kingdom to indicate urgent journeys by an emergency service. This usage is colloquially known as "blues and twos", which refers to the blue lights and the two-tone siren once commonplace (although most sirens now have a range of tones like Wail, Yelp and Phaser).

  4. Blue Lights (2023 TV series) - Wikipedia

    en.wikipedia.org/wiki/Blue_Lights_(2023_TV_series)

    Release. 27 March 2023. ( 2023-03-27) –. present. Blue Lights is a Northern Irish police procedural television drama series set in the fictional Blackthorn police station in Belfast, Northern Ireland, where the series was filmed. Created and written by Declan Lawn and Adam Patterson, it began broadcasting on BBC One on 27 March 2023.

  5. 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.

  6. Blue Light (counter-terrorist subunit) - Wikipedia

    en.wikipedia.org/wiki/Blue_Light_(counter...

    Blue Light was an American counter-terrorist subunit of the 5th Special Forces Group that existed into the late 1970s. [ 1] According to Colonel Charles Beckwith 's memoirs, this counter-terrorist group was formed by U.S. Army Special Forces leadership to fill an important counter-terrorism gap until Delta Force became operational.

  7. Diffuse sky radiation - Wikipedia

    en.wikipedia.org/wiki/Diffuse_sky_radiation

    Diffuse sky radiation. In Earth's atmosphere, the dominant scattering efficiency of blue light is compared to red or green light. Scattering and absorption are major causes of the attenuation of sunlight radiation by the atmosphere. During broad daylight, the sky is blue due to Rayleigh scattering, while around sunrise or sunset, and especially ...

  8. Cyanopsia - Wikipedia

    en.wikipedia.org/wiki/Cyanopsia

    Cyanopsia is a medical term for seeing everything tinted with blue. It is also referred to as blue vision. Cyanopsia often occurs for a few days, weeks, or months after removal of a cataract from the eye. Cyanopsia also sometimes occurs as a side effect of taking sildenafil, tadalafil, or vardenafil. [ 1]

  9. Wikipedia:WikiProject UK Railways/Colours list - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:WikiProject_UK...

    This page contains a list of colours used in previous/next station boxes on UK railway station (and related/similar) articles, believed to be up-to-date as of 26 December 2023. Some of the colours have templates (e.g. {{ NXEA colour }}) which can be used to implement them. If you can't find the desired colour on this page, use {{ Temporary rail ...

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