While driving does anyone thought about the traffic signals, how they work, what is the purpose, what is the function etc. For this one has to explore internet to get to know that what type of technology or device is being used. It consists of LED’s lights which states light emitting diode, engineers mostly know about this device as they practically use it so they are well aware of its function. They are used in TV’s, DVD’s, traffic signals and much more. It was discovered in 1907 by a British experimenter, and was commercially used in lamps and for the replacement of incandescent. There are many types of LED’s lights like red lights are used to bring the brightness for indicators, white light is used for illumination, as its development increasing day by day so the color varieties are growing up. Basically it consists of a chip, which is semi conducting material. This is all about physics, so the person who has studied this subject he can easily get the idea of these mini lights. They are designed in 30-60 milliwatts of power. They have a limited lifetime if not properly handled, its performance depends on the temperature. Blue and green LED’s are mostly used, as they give a texture of white light. LED’s have a variety of shapes and sizes, it consists of the main types of high, low, miniature power lights. The life of LED lights is 100,000 hours, it is used to reduce power consumption. It almost approaches 80% efficiency and used to convert electrical power to light energy. It is a good option to save light energy, and if to replace the bulbs in offices or any other area it is difficult to change so for these LED’s can be better option. Many applications are under process for the advancement of these lights. If you compare these lights with bulbs than they are not damaged by shaking or by vibration. They have less heat and are easy to use as it cannot harm fingers. Unlike bulbs that have a short life time, LED’s lights cut down the material cost and there is no need to change the color lenses. They are waterproof which is good point and great advantage, it is nominal for the environment as it does not contain mercury. If LED’s are poorly designed than cannot last for long, and are not efficient even. They can be used anywhere like in the grounds, sport areas, crime locations etc. They are not that much expensive, even they are used in cars, wedding decorations. They are small and are very efficient than other bulbs. They are sensitive and are non toxic which means that they do not contain gases, and cannot be burned out easily. They are designed to focus the light in a certain direction, hence there benefits are time saving and useful nowadays when people face load shedding issues.