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  2. Blue field entoptic phenomenon - Wikipedia

    en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon

    In a technique known as blue field entoptoscopy, the effect is used to estimate the blood flow in the retinal capillaries.The patient is alternatingly shown blue light and a computer generated picture of moving dots; by adjusting the speed and density of these dots, the patient tries to match the computer generated picture to the perceived entoptic dots.

  3. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    Red and blue emergency lights on a fire engine in Canberra, Australia. Emergency vehicle lighting, also known as simply emergency lighting or emergency lights, is a type of vehicle lighting used to visually announce a vehicle's presence to other road users.

  4. Blue light spectrum - Wikipedia

    en.wikipedia.org/wiki/Blue_light_spectrum

    It emits more blue light than traditional incandescent bulbs, potentially impacting the quality of sleep and eye health if used excessively at night. [2] [8] A person using a smartphone at night. Blue light is emitted by digital screens such as computers, tablets, smartphones, and televisions, which can lead to extended exposure in modern lives ...

  5. High-intensity discharge lamp - Wikipedia

    en.wikipedia.org/wiki/High-intensity_discharge_lamp

    However, the bright headlights have given rise to complaints about glare. [10] HID lamps are used in high-performance bicycle headlamps, as well as flashlights and other portable lights, because they produce a great amount of light per unit of power. As the HID lights use less than half the power of an equivalent tungsten-halogen light, a ...

  6. Shuji Nakamura - Wikipedia

    en.wikipedia.org/wiki/Shuji_Nakamura

    Shuji Nakamura (中村 修二, Nakamura Shūji, born May 22, 1954) is a Japanese-American electronic engineer and inventor of the blue LED, a major breakthrough in lighting technology. [5]

  7. Halogen lamp - Wikipedia

    en.wikipedia.org/wiki/Halogen_lamp

    Like all incandescent light bulbs, a halogen lamp produces a continuous spectrum of light, from near ultraviolet to deep into the infrared. [23] Since the lamp filament can operate at a higher temperature than a non-halogen lamp, the spectrum is shifted toward blue, producing light with a higher effective color temperature and higher power ...

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