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This is similar to previously used geopush technology based on GPS, but with a much reduced impact on battery life and much extended precision. Another application is an indoor positioning system, [3] [4] [5] which helps smartphones determine their approximate location or context. With the help of a Bluetooth beacon, a smartphone's software can ...
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 .
The flicker index, used for measuring perceptible light modulation, has a range from 0.00 to 1.00, with 0 indicating the lowest possibility of flickering and 1 indicating the highest. Lamps operated on magnetic ballasts have a flicker index between 0.04 and 0.07 while digital ballasts have a flicker index of below 0.01. [6]
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In addition to utilitarian flashlights, novelty, toy, and ornamental portable electric lights have been made in a myriad of shapes; in the 1890s, one of the earliest portable battery light applications was a type of novelty porcelain tie pin with a concealed bulb and battery.
The battery backups can operate the controller in emergency mode with the red light flashing or in fully functional mode. In 2004, California Energy Commission recommended to have local governments to convert their traffic lights to LEDs with battery backups. This would lower the energy consumption and enhance the safety at major intersections.
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