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  2. Exit sign - Wikipedia

    en.wikipedia.org/wiki/Exit_sign

    As battery-backup systems became smaller and more efficient, some exit signs began to use a dual-power system. Under normal conditions, the exit sign was lit by mains power and the battery was maintained in a charged state. In the event of a power outage, the battery would supply power to light the sign.

  3. Tritium radioluminescence - Wikipedia

    en.wikipedia.org/wiki/Tritium_radioluminescence

    The more tritium is initially placed in the tube, the brighter it is to begin with, and the longer its useful life. Tritium exit signs usually come in three brightness levels guaranteed for 10, 15, or 20-year useful life expectancies. [5] The difference between the signs is how much tritium the manufacturer installs.

  4. Emergency light - Wikipedia

    en.wikipedia.org/wiki/Emergency_light

    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 .

  5. Emergency power system - Wikipedia

    en.wikipedia.org/wiki/Emergency_power_system

    The loss of normal power also triggers a battery operated starter system to start the generator, similar to using a car battery to start an engine. Once the transfer switch is switched and the generator starts, the building's emergency power comes back on (after going off when normal power was lost).

  6. North American railroad signals - Wikipedia

    en.wikipedia.org/wiki/North_American_railroad...

    The early color light signals were visible for only about half that distance (2,500 feet or 760 metres) while using about the same electrical current, then a major concern in "primary battery territory". By 1925, the development of "high-transmission colors" of railroad glassware by Gage and Corning Glass improved this limited distance to an ...

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