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2. Emergency light - Wikipedia

   en.wikipedia.org/wiki/Emergency_light

   An emergency light is a battery-backed lighting device ... as well as regular maintenance and replacement of batteries and bulbs. emergency lights test is important ...

3. Flashlight - Wikipedia

   en.wikipedia.org/wiki/Flashlight

   Shaking the flashlight charges a capacitor or a rechargeable battery that supplies current to a light source. Such flashlights can be useful during an emergency, when utility power and batteries may not be available. Dynamo-powered flashlights were popular during the Second World War since replacement batteries were difficult to find.

4. Exit sign - Wikipedia

   en.wikipedia.org/wiki/Exit_sign

   Inside of an emergency light/exit sign combination unit with light bulbs and backup battery [16] Since visibility may be reduced in a fire, due to smoke or failure of electric lighting, the sign is often permanently illuminated, usually by one of:

5. Maglite - Wikipedia

   en.wikipedia.org/wiki/Maglite

   1982: MagCharger: a larger more expensive model popular with public safety and emergency-services personnel. This light is much brighter than typical Maglites, and uses an incandescent Halogen bulb and a rechargeable NiCad or NiMH battery pack. 1984: Two AA cell batteries (Mini Maglite) Maglite's first personal size flashlight

6. Electrical ballast - Wikipedia

   en.wikipedia.org/wiki/Electrical_ballast

   A commonly used light in the home in the 1960s in 220–240 V countries was a circular tube ballasted by an under-run regular mains filament lamp. Self ballasted mercury-vapor lamps incorporate ordinary tungsten filaments within the overall envelope of the lamp to act as the ballast, and to partially compensate for the red-deficient light ...

7. Mechanically powered flashlight - Wikipedia

   en.wikipedia.org/wiki/Mechanically_powered...

   The best designs use a supercapacitor instead of a rechargeable battery, since these have a longer working life than a battery. This, along with the long-life light-emitting diode which does not burn out like an incandescent bulb, give the flashlight a long lifetime, making it a useful emergency light. A disadvantage of many current models is ...