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An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage. In the United States, emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories, apartments, and hotels.
These flashlights can also be distinguished by the technique used to store the energy: a spring, [1] a flywheel, a battery or a capacitor. Since they are always ready for use, mechanically powered flashlights are often kept as emergency lights in case of power outages or other emergencies. They are also kept at vacation homes, cabins, and other ...
Other models include features such as a solar cell phone charger, [6] an AM/FM radio, or a siren to call for help in an emergency. Some models include a hand crank dynamo for charging at night. [ 7 ] An experimental solar flashlight the size of a credit card features a white LED powered by 16 solar cells.
In 1999, Lumileds Corporation of San Jose, California, introduced the Luxeon LED, a high-power white-light emitter. This made possible LED flashlights with lower power consumption and running time better than incandescent flashlights with similar light output. The first Luxeon LED flashlight was the Arc LS, designed in 2001.
1988: One AAA cell battery (Maglite Solitaire) Mag Instrument's key chain flashlight. 2006: Maglite LED Flashlight and Upgrade Module: 3-watt Luxeon III LED from Lumileds. [2] 2006: Mini Maglite LED 2AA. 2008: MagCharger: Upgraded Nickel/Metal Hydride battery pack increases charge time and second generation Halogen bulb increases light output.
One-color light is well suited for traffic lights and signals, exit signs, emergency vehicle lighting, ships' navigation lights, and LED-based Christmas lights Because of their long life, fast switching times, and visibility in broad daylight due to their high output and focus, LEDs have been used in automotive brake lights and turn signals.
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