ABSTRACT Gravity light is a gravity powered lamp designed for use in developing as a replacement lamps. It uses a bag filled with rocks or earth, attached to a cord, which slowly descends similar to the weight drive in a pendulum clock. The gravity light consists of an LED bulb fixed to an adjustable lamp that can be hooked up on a wall or hung from a ceiling. It also comprises a pulley mechanism and a ballast bag hanging from the lamp. With gravity light , it takes very few seconds create enough energy to provide lighting for half an hour as a required by simply lifting the weight.

INTRODUCTION In some parts of the world, lighting is provided through expensive and polluting kerosene. Kerosene lamps are hazardous to health and environment and constantly require replenishment. Fumes which are raised from the burning of biomass fuels can cause cataracts and eye infections as well as emitting smoke that is the equivalent to smoking two packets of cigarettes everyday. Also, it was estimated that nearly 2.5 million people in India alone suffer severe burns from overturned kerosene lamps every year as well as the vast amounts of carbon dioxide produced. This is a safe alternative that will be of great benefit to many people across the globe - a gravity-powered LED light. Unlike solar-powered lamps, the gravity light can be operated all the day and night and under any climatic conditions with zero running costs.

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How does it Work? The gravity light consists of an LED bulb fixed to an adjustable lamp that can be hooked up on a wall or hung from a ceiling. It also comprises a pulley mechanism and a ballast bag hanging from the lamp. The ballast bag is filled with up to 9 kg of rock, sand or soil. The gravity light works on the principle similar to that of pendulum clocks that are operated with the help of weights. The potential energy is represented by the ballast material. When the ballast bag is suspended, the potential energy in the ballast is converted by gravity with a slow descent of the bag. The converted energy then generates light. The gravity light can be operated for 30 mins continuously before the ballast bag needs to be refilled. The strength of the light can be adjusted from strong lighting to long-lasting low-level lighting. The two terminals present at the front of the gravity light can be used as a generator.

Benefits of Gravity Light It is inexpensive It has no operating costs It does not requires any batteries It can power radios, reading lights and other small electrical devices It can recharge batteries

CONCLUSION   Electric lighting can be easily taken for granted. Millions of people in the developing countries do not have the luxury of electricity and depend on kerosene lamps. Kerosene is expensive and inhaling the fumes of kerosene is dangerous. An inexpensive renewable and sustainable gravity-powered light could indeed be an appropriate solution for lighting demands across the world. The gravity light has now captured a lot of public interest. This light may also find applications as a camping light or an emergency light in the future, but for now the gravity light is an example of something that just seems like the basic science of gravity, but is, and can be so much more to people around the world. Being able to supply lights that have no running cost for $5 is an incredible feat and one which could help the lives of millions of people seeking sustainable light at low cost.