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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. [3] Nakamura specializes in the field of semiconductor technology, and he is a professor of materials science at the College of Engineering of the University of ...
The other is to use a phosphor material to convert monochromatic light from a blue or UV LED to broad-spectrum white light, similar to a fluorescent lamp. The yellow phosphor is cerium-doped YAG crystals suspended in the package or coated on the LED. This YAG phosphor causes white LEDs to appear yellow when off, and the space between the ...
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LED lighting, digital screens, and fluorescent bulbs are examples of common artificial blue light sources. [7] [6] LED lighting is widely used due to its durability and energy efficiency. [2] 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]
Two types of icicle lights are sold at Halloween: all-orange, and a combination of purple and green known as "slime lights". Easter lights are often produced in pastels. These typically have white wire and connectors. Closeup of a mini light Strings on piping and on a menorah
As a result of the Purkinje effect, the dark-adapted human eye is very sensitive to blue and green light that LED street lights emit in large amounts [citation needed], as compared to the yellow and orange high-pressure sodium lights that are typically being replaced. [10] [11] [12] This magnifies the effect of light pollution - particularly ...
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