ABSTRACT

"Solar Automated Lighting System" from the above title simply means the use of "Solar energy" to simply operate light automatically. Before we go deeply into this topic we have to first understand the meaning of "Solar energy and how it can be conserved and used for different purposes. Solar energy can be defined simply as "electromagnetic radiations" reaching us from the sun. This cheap source of energy that is being obtained in our environment is an alternative source of energy which is environmentally clean and friendly and does not have, an adverse effect on individuals and the environment at large unlike the use of petroleum that has caused a lot of pollutions in jour environment. The burning of petrol & diesel oil by motor vehicles, power plants and factories releases a lot of pollutants into the air. From example, for every l00din of petrol burnt an average car releases about: .0.15kg carbon 11 oxide .0.01kg nitrogen oxide 0.008kg un-burnt hydrocarbons 0.0005kg solid particles and .0.0005kg sulphur IV oxide into the atmosphere. A stationary car that has its engines still running add much more pollutants than what is listed above; often lead compounds such as tetraethyl Lead are added to petrol to prevent knocking. Burning such petrol releases lead compounds into the atmosphere. All air pollutants affect the health of people seriously. They cause dizziness, fatigue and lethargy. The solid particles clog and damage the lung tissues, lead compounds have been shown to cause brain damage in young children, animals and plants and also adversely affected by air pollutants. The problem of airpollution is serious in big cities and industrial areas where coal, gas and petroleum are used as energy source. Besides air pollution, there is also problem of oil spill. These occur when there are accidents or blow-up of off.Thore oil rigs, or when tankers transporting oil leak into the sea. When oil spills occur, the surrounding coasts are coated with oil. As a result, sea-birds, fish and other marine life may be killed in large numbers. It is very difficult and expensive to clean up oil spills with various negative effects of the use of petroleum as a source ot energy outlined above. We will now infer that the conservation of "solar energy" as an alternative source of energy because it is cheap, clean and environmentally friendly, economically advantageous, and long lasting etc. This form of energy is not all new to man, for it is as old as man's existence on earth. The length of time and proportion of the amount of solar radiations reaching the earth varies from place to place, due to earths orientation and attenuation factors. Solar energy utilization is the concept of usable solar radiation. Our interest is with the energy that can be put to work (i.e. energy that can be harvested). It has been several purposes. ,. Solar radiations are used in drying agricultural products, clothes and for warming water in containers. The use of solar energy in these various ways have not employed enough scientific principles for tapping solar radiations for man's economic use.