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Around 2017, left-wing YouTubers such as ContraPoints (who identified as bisexual at the time) began to light their videos with pink, purple, and blue neon lights. [10] The use of bisexual lighting became a popular meme in 2018, with multiple Twitter threads showcasing instances of the lighting scheme going viral, as well as photographs of ...
The attainment of high efficiency blue LEDs was quickly followed by the development of the first white LED. In this device a Y 3 Al 5 O 12:Ce (known as "YAG" or Ce:YAG phosphor) cerium-doped phosphor coating produces yellow light through fluorescence. The combination of that yellow with remaining blue light appears white to the eye.
So viewing fluorescent paint requires a longwave UV light which does not emit much visible light. This is called a black light. It has a dark blue filter material on the bulb which lets the invisible UV pass but blocks the visible light the bulb produces, allowing only a little purple light through.
An FPL spokesperson explained that over time, some LED streetlights in FPL’s service area are emitting a violet or purple hue rather than the standard white light because of a manufacturer defect.
A blacklight, also called a UV-A light, Wood's lamp, or ultraviolet light, is a lamp that emits long-wave ultraviolet light and very little visible light. [ 1 ] [ 2 ] [ 3 ] One type of lamp has a violet filter material, either on the bulb or in a separate glass filter in the lamp housing, which blocks most visible light and allows through UV ...
LED bulbs are also made that will retrofit incandescents with the same base, but may affect the electrical relay that controls the blinking of turn signals, or cause others sensors to assume that a light bulb is out (see idiot light). In this type of "bulb", all of the LEDs may light regardless of which of the contacts are activated on the base ...
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 ...
Nitrogen glow Oxygen glow Electrical discharge in air Particle beam from a cyclotron. Ionized-air glow is the luminescent emission of characteristic blue–purple–violet light, often of a color called electric blue, by air subjected to an energy flux either directly or indirectly from solar radiation.