A light-emitting diode (LED) is a semiconductor of light source. LEDs are used as indicator lamps in many devices and are increasingly used for general lighting. Basically, LEDs are just tiny light bulbs that fit easily into an electrical circuit. But unlike ordinary incandescent bulbs, they don't have a filament that will burn out, and they don't get especially hot. They are illuminated solely by the movement of electrons in a semiconductor material, and they last just as long as a standard transistor. 
The lifespan of an LED surpasses the short life of an incandescent bulb by thousands of hours. Studies reveal that LED bulbs produce less carbon than older bulbs, which can be very useful to get rid of the ill effects of global warming.
These energy saving bulbs have a very long life, and they are able to remain consistent despite of long-term use. In other words, they are not easily hampered, even if you are using them for long hours. So, one can buy the bulbs according to their preference, those which do not need to be swapped frequently.
Light-emitting diodes are used in applications as diverse as aviation lighting, automotive lighting, advertising, general lighting, and traffic signals. LEDs have allowed new text, video displays, and sensors to be developed, while their high switching rates are also useful in advanced communications technology. LED grow lights have been one of the best innovations in farming as it helps improve the different aspects of gardening. There are interesting applications also which uses LED bulbs such as UV-LEDs for the sterilization of water and disinfection of devices and to enhance the photosynthesis in plants as a grow light.
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