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A light emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in lots of devices and are increasingly used for other lighting. LEDs were first used as replacements for incandescent and neon indicator lamps. First used in costly laboratory and electronic check equipments, but as time passed, they are used in appliances as TV, radios, calculators and even watches.

As LEDs been a commercial success, more people are now turning to LED display. It is a flat panel display, which makes use of light-emitting diodes as a video display. They are used outside in store signs and billboards and as indoor lighting. They can now see LED displays on public transport vehicles, stores and even stadiums. 56

Before the popular success of LED, they had electronic display. It is an electronic part used to convert electrical signals in to visual imagery in actual time suitable for direct interpretation by a human operator. It serves as the virtual port between a human and machine. The major electronic display application is in home color tv. However, the electronic display industry declined in 1990s due to manufacturing advances in liquid-crystal displays (LCDs).

Although, it's high preliminary cost, LED has lots of benefits. It is safe to make use of under normal conditions. It also boast its light, meaning it emits very small heat.32 It's comparatively long useful life. Nowadays, lots of establishments are using LED signs due to the low energy consumption and their low maintenance. LED signs can be found very anywhere. From stores, to vehicles, traffic lights and exit signs in huge buildings.

Aside from signs, LEDs are used for lighting. They are used in street lights and architectural lighting. Due to LEDs long lifetime, it is being used in automotive lighting on cars, motorcycles, and bicycle lights. They are used in aviation lighting, . They are also suitable for backlighting for LCD televisions and laptop computer displays. Aside from that, they are used in aquarium lights. Since LEDs are small and require small power, they are also used in hand held devices such as flashlights. They are now used often in all market areas from commercial to home use: standard lighting, AV, stage, theatrical, architectural, and public installations, and wherever artificial light is used.

LEDs are being used all over the world. From the largest to the smallest sign or lighting method, they can guarantee that LEDs will be efficient and long-lasting. It is safe for us and the environment as well. Although, like other products there's disadvantages as well, but it can save your funds because it is economically sustainable.

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