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  2. Emergency light - Wikipedia

    en.wikipedia.org/wiki/Emergency_light

    A small emergency light. In the United States, modern emergency lighting is installed in virtually every commercial and high occupancy residential building. The lights consist of one or more incandescent bulbs or one or more clusters of high-intensity light-emitting diodes (LED). The emergency lighting heads have usually been either ...

  3. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    Emergency vehicle lighting, also known as simply emergency lighting or emergency lights, is a type of vehicle lighting used to visually announce a vehicle's presence to other road users. A sub-type of emergency vehicle equipment , emergency vehicle lighting is generally used by emergency vehicles and other authorized vehicles in a variety of ...

  4. Exit sign - Wikipedia

    en.wikipedia.org/wiki/Exit_sign

    Early exit signs generally either were made of metal and lit by a nearby incandescent light bulb [4] or were a white glass cover with "EXIT" written in red, placed directly in front of a single-bulb light fixture. A flaw in these designs was that in a fire the power to the light often failed.

  5. Traffic signal preemption - Wikipedia

    en.wikipedia.org/wiki/Traffic_signal_preemption

    Traffic signal preemption (also called traffic signal prioritisation) is a system that allows an operator to override the normal operation of traffic lights.The most common use of these systems manipulates traffic signals in the path of an emergency vehicle, halting conflicting traffic and allowing the emergency vehicle right-of-way, thereby reducing response times and enhancing traffic safety.

  6. Trouble light - Wikipedia

    en.wikipedia.org/wiki/Trouble_light

    A trouble light, also known as a rough service light, drop light, or inspection lamp, is a special lamp used to illuminate obscure places and able to handle moderate abuse. The light bulb is housed in a protective cage and a handle that are molded to form a single unit.

  7. Tritium radioluminescence - Wikipedia

    en.wikipedia.org/wiki/Tritium_radioluminescence

    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. The light produced by GTLSs varies in color and size.