A light emitting diode (LED), is a semiconductor device that emits visible light when an electric current passes through it. Some examples of everyday devices that use LEDs range from automotive headlamps, general lighting, traffic signals, and camera flashes.
You can basically see an LED as a small light bulb, with these 3 key differences from incandescent light bulbs:
1. They do not have a filament
2. They are more efficient
3. They have a longer lifespan.
So what do these differences mean?
Incandescent light bulbs have a filament, which is heated with electricity and produces light. In other words, the filament results to light and heat. Since the purpose of a light bulb is to produce light, the energy used to produce heat is wasted. LEDs do not use filaments. As a result, almost all the electricity is used for making light, not heat; therefore, making them more efficient. This is good news for consumers as it also means reduced electricity bills! Due to its efficiency, LEDs used in LED signs generally last approximately 100,000 hours (about 11 years)!