Emergency light
Emergency lighting units are used in commercial and residential settings to provide battery powered lighting during power outages. Emergency lighting is required by most safety codes. The function of emergency lighting is to illuminate specific premises according to regulations to allow safe exit from the premises, for example, when the supply network malfunctions due to network failure. Emergency lights provide temporary lighting in the event of a power failure. In addition to marking the location of the emergency exit, light emitted from the emergency lighting fixture illuminates the floor in the area of the emergency exit to clearly light the path to the exit. During normal operation, power is provided from power mains to operate the lamp and to charge a backup power source. When power from the mains is interrupted, the backup power source provides power to the lamp for a limited time. Emergency lighting units employ lamps which are oriented to illuminate passages to exits and are powered by direct current obtained either from internal batteries or from a decent conduit connected to a central battery bank. During normal power conditions, the batteries are charged by a charging circuit. The most common type of emergency lighting is the exit sign which is also the most noticed not only due to its ubiquity but also due to the fact that most exit signs are constantly illuminated and are therefore readily seen. Emergency lighting fixtures are frequently positioned near emergency exits to light emergency egresses from the area, and are commonly used in commercial buildings, residences, and the like. Exit signs are typically placed above doorways or in egress paths to indicate the most efficient manner of exiting a building when emergency occurs. Emergency lighting units typically comprise a casing containing batteries, one or more lights, a connection to line power and a detector for sensing a loss of power, the unit also including a switch responsive to the detector for activating the lighting system. A battery is contained in the housing together with a battery charging and control circuit coupled between the power mains and one or more lamps. When power fails, battery power is switched to the lamps through a relay, diode or similar known switching arrangement.
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