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Green electroluminescence from a point contact on a crystal of SiC recreates Round's original experiment from 1907. Close-up of a 1 watt red power led. Electroluminescence as a phenomenon was discovered in 1907 by the English experimenter H. J. Round of Marconi Labs, using a crystal of silicon carbide and a cat's-whisker detector.
2016 United States presidential election results by county, on a color spectrum from Democratic blue to Republican red. A purple state refers to a swing state where both Democratic and Republican candidates receive many votes without an overwhelming majority for either party. Purple states are also often referred to as "battleground" states.
A Red Scare is a form of moral panic provoked by fear of the rise, supposed or real, of leftist ideologies in a society, especially communism. Historically, "red scares" have led to mass political persecution , scapegoating , and the ousting of those in government positions who have had connections with left-wing to far-left ideology.
"Keychain" type lamps operating on button batteries, or lights using a single 5 mm LED, may only produce a few lumens. Even a small LED flashlight operating on an AA cell, but equipped with an LED, can emit 100 lumens. The most powerful LED flashlights produce more than 100,000 lumens and may use multiple LEDs. [14]
2012: Mini Maglite AA Pro 215 Lumens and Mini Maglite AA Pro+ 245 Lumens. 2012: Maglite 2D pro 274 Lumens with a Cree XP-G rather than a Cree XP-E, increasing brightness while decreasing beam distance efficiency. 2012: Maglite Mag-Tac flashlight plain bezel, 310 Lumens, low mode at around 100 Lumens. First Maglite flashlight to use CR123A ...
A light emitting diode (LED) incapacitator is a weapon designed like a flashlight. It emits an extremely bright, rapid, and well-focused series of "differently-colored random pulses". It emits an extremely bright, rapid, and well-focused series of "differently-colored random pulses".
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