About LED

A LED (Light Emitting Diode) is usually a small area light source, often with extra optics added to the chip that shapes its radiation pattern. LED's are often used as small indicator lights on electronic devices and increasingly in higher power applications such as flashlights and area lighting. The color of the emitted light depends on the composition and condition of the semiconducting material used, and can be infrared, visible, or ultraviolet. LED's can also be used as a regular household light source. Besides lighting, interesting applications include sterilization of water and disinfection of devices.

LED Lamp

A LED Lamp  is a type of solid state lighting that utilizes light-emitting-diodes LED's) as a source of illumination rather than electrical filaments or gas. LED lamps (also called LED bars or Illuminators) are usually clusters of LED's in a suitable housing. They come in different shapes, including the standard light bulb shape with a large E27 Edison srew and shape with a bi-pin base. Other models might have a small Edison E14 fitting,  MR16 shape (Bipin cap) or GU10 bayonet socket). This includes low voltage (typically 12 V halogen-like) varieties and replacements for regular AC mains (120-240 V AC) lighting.

Advantages of LED's

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  • LED's produce more light per watt than incandescent bulbs; this is useful in battery powered or energy-saving devices.
  • LED's can emit light of an intended color without the use of color filters that traditional lighting methods require. This is more efficient and can lower initial costs.
  • The solid package of the LED can be designed to focus its light.
  • When used in applications where dimming is required, LEDs do not change their color tint as the current passing through them is lowered, unlike incandescent lamps, which turn yellow.
  • LED's are ideal for use in applications that are subject to frequent on-off cycling, unlike fluorescent lamps that burn out more quickly when cycled frequently, or HID lamps that require a long time before restarting.
  • LED's, being solid state components, are difficult to damage with external shock.
  • LED's can have a relatively long useful life.
  • LED's light up very quickly.
  • LED's can be very small and are easily populated onto printed circuit boards.
  • LED's do not contain mercury, unlike compact fluorescent lamps.

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