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LEDs are devices that emit visible light when powered by a current. They were first developed in the 1950s but only recently have become a viable commercial product. The development of LEDs has revolutionized the lighting industry, providing high intensity, low-power light sources for a variety of applications. They are now used in a host of applications, from automotive dash board lighting to the ever popular Christmas lights.One of the major applications for LEDs is in the field of circuit board indicators. LEDs are used to indicate the presence of current in a circuit, alerting the user if something is wrong. The most common type of LED used in this way is the light emitting diode (LED). A diode is a two-terminal electrical device that emits light when a current passes through it. LEDs are typically connected to a voltage source and are used to indicate whether the current is flowing in the correct direction. The colors of the LED vary depending on the type of the diode and the type of the circuit board.Another popular application of LEDs is in the form of arrays. Arrays of LEDs are used to create illuminated displays or signs. These arrays can be used to display text or images. For larger displays, several individual LED arrays may be used in combination to create a larger overall display. The colors of the LEDs vary depending on the type of design and application.Light bars are another application for LEDs. Light bars are typically used to create focused beams of light for illuminating a specific area. For example, in the automotive industry, LED light bars may be used as taillight systems. These LED light bars are usually mounted on the rear of the vehicles and they provide an intense beam of light to illuminate the road behind the vehicle.In addition to being used as a light source, LEDs can also be used to create bar graphs. Bar graphs are chartswhich display the magnitude of a given quantity using vertical bars of varying heights. Bar graphs are often used in scientific applications to display the magnitude of a physical property. LEDs are used to create bar graphs because they can provide a very bright and focused beam of light. This is useful when trying to display quantitative data.Finally, LEDs are used to create illuminated signs and displays. LEDs are often used to create illuminated signs for outdoor venues, such as concert arenas or sporting events. Additionally, LEDs can be used for interior applications, such as backlighting displays in stores or other facilities.In summary, LEDs are a very versatile source of light and are used in a variety of applications. The most common applications include circuit board indicators, array displays, light bars, bar graphs and illuminated signs. LEDs offer a high intensity light source, while consuming very little power. Additionally, they are extremely durable, making them an ideal choice for a wide range of applications.

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