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An Emergency Light Is A MustAn emergency light is the people's savior when power vanishes without warning. Hand-held torch lights have always functioned as an emergency light to help people manipulate their way on unlit roads, or to help them find their way inside a home where power has failed. However, the term emergency light is nowadays applied to a light that lights up automatically when power fails. Many homes and buildings have them, and in some places the law insists that larger buildings are well protected against power outrages by properly installed emergency lights. The basic components of an emergency light are one or more light bulbs and a power generator unit. Older models of emergency light were incandescent lights. But after the arrival of LED lights, many building owners prefer to use LED lights because it is likely to be a lifetime investment. Since an emergency light is likely to be used only infrequently, and LED lights will typically have a life span of more than 50,000 hours, the question of changing the lights are not likely to arise. The light intensity of an emergency light will have to be decided by the area it has to cover. High lumen floodlights are used in many larger buildings since they will have a larger area to be illuminated. When the power fails, the sensor in the emergency light is activated through a relay mechanism. Some models of emergency lights get switched off by itself by the same mechanism when power returns, though others will have to be manually switched off. If it is not reset, these models will remain lit even after the regular power supply is back to normal. The word egress means coming or going out, and an emergency light setting is also known as egress lighting or emergency egress lighting system. In many buildings emergency lights are installed near the exit sign to make it easy for people to leave in case of unexpected power failure. In some cases the exit sign itself will be the emergency light. Besides buildings, emergency light is used in aircrafts, ships, army tanks, and amphibious vehicles that can be driven both on land and water. It is necessary in mines, theaters, and at all temporarily set up fairgrounds or carnival venues. In other words, an emergency light is useful and necessary at every place where emergency egress or evacuation of people could become necessary. Wherever it is used, an emergency light should have a self-contained power source. Lots of research is being conducted in the field of emergency lighting systems. An emergency light used nowadays has a switch that can be manually operated or is automatically activated by the built-in sensor. Experiments are being made in developing lighting systems, which can use fresh, or salt-water activation, or chemical lighting, or bioluminescent lighting, depending upon the conditions in which they are used. ...

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