Light Emitting Diode

Why use LEDsĀ ?

LEDs have several advantages over conventional incandescent lamps.

  • they don’t have a filament that will burn out, so they last much longer
  • their small plastic bulb makes them a lot more durable
  • They also fit more easily into modern electronic circuits
  • the main advantage is efficiency. In conventional incandescent bulbs, the light-production process involves generating a lot of heat (the filament must be warmed). This is completely wasted energy, unless you’re using the lamp as a heater, because a huge portion of the available electricity isn’t going toward producing visible light. LEDs generate very little heat, relatively speaking. A much higher percentage of the electrical power is going directly to generating light, which cuts down on the electricity demands considerably.
  • LEDs are brighter. The LED arrays fill the entire “hole” and have equal brightness across the entire surface, making them brighter overall.
  • LED bulbs last for years, while halogen bulbs last for months.
  • LED bulbs save a lot of energy. this is useful in battery powered or energy-saving devices
  • They do not contain Mercury or any harmful chemical substance which affects the environment, like CFLs.
  • LEDs 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.
  • 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.
  • LEDs are do not burn out with frequent on-off cycling, like normal bulbs.
  • LEDs, are difficult to damage with external shock and do not break if dropped on the ground.

Prices of LEDs

Until recently, LEDs were too expensive to use for most lighting applications because they’re built around advanced semiconductor material. The price of semiconductor devices has plummeted over the past decade, however, making LEDs a more cost-effective lighting option for a wide range of situations.

  • more expensive than incandescent lights up front,
  • lower cost in the long run can make them a better buy

Usage

  • Most cities in the United States are in the process of replacing their incandescent traffic lights with LED units
  • Residential Lighting
  • security Lighting
  • Flashlights – maglite
  • Remote controls, such as for TVs and VCRs, often use infrared LEDs.
  • Movement sensors, for example in optical computer mice
  • In optical fiber cables
  • Toys and recreational sporting goods
  • In pulse oximeters for measuring oxygen saturation
  • Computers, for hard drive activity and power on.
  • Sterilization of water and other substances using UV light.

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