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  2. Blue field entoptic phenomenon - Wikipedia

    en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon

    The blue field entoptic phenomenon is an entoptic phenomenon characterized by the appearance of tiny bright dots (nicknamed blue-sky sprites) moving quickly along undulating pathways in the visual field, especially when looking into bright blue light such as the sky. [1] The dots are short-lived, visible for about one second or less, and travel ...

  3. Larimar - Wikipedia

    en.wikipedia.org/wiki/Larimar

    Larimar is the tradename for a rare blue variety of the silicate mineral pectolite found only in the Dominican Republic, around the city of Barahona. Its coloration varies from bluish white, light-blue, light-green, green-blue, turquoise blue, turquoise green, turquoise blue-green, deep green, dark green, to deep blue, dark blue and purple, violet and indigo and the larimar can come in many ...

  4. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    v. t. e. The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).

  5. Color temperature - Wikipedia

    en.wikipedia.org/wiki/Color_temperature

    Color temperature is a parameter describing the color of a visible light source by comparing it to the color of light emitted by an idealized opaque, non-reflective body. The temperature of the ideal emitter that matches the color most closely is defined as the color temperature of the original visible light source.

  6. Blue hour - Wikipedia

    en.wikipedia.org/wiki/Blue_hour

    Blue hour. The blue hour (from French l'heure bleue; [1] [a] pronounced [lœʁ blø]) is the period of twilight (in the morning or evening, around the nautical stage) when the Sun is at a significant depth below the horizon. During this time, the remaining sunlight takes on a mostly blue shade. This shade differs from the colour of the sky on a ...

  7. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    The flat bottom surfaces of the anvil and post embedded inside the epoxy act as anchors, to prevent the conductors from being forcefully pulled out via mechanical strain or vibration. A light-emitting diode ( LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron ...

  8. Blue light station - Wikipedia

    en.wikipedia.org/wiki/Blue_Light_Station

    Blue light station. A Blue Light Station is a combined emergency telephone and emergency power-off switch in rapid transit stations and other points along electrified railways. They are common in the United States and Canada. [citation needed] The location of such a device is usually indicated by a blue light.

  9. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. ... Blue-white thermal emission is not often seen, ...

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