Jan 26, 2009

Save Earth with LED lights

LED stands for Light Emitting Diode. LED's are now found on almost every electronic device including MP3 players DVD , TV's, clock radios and computers. LED's have been popular for decades, however today they are cheaper, brighter and come in more colors than ever before. While the incandescent light bulb has been the light of choice for at least 100 years, many believe the LED will soon replace it. Here is how LED light bulbs work:

What is an LED Light Bulb?

LED's are very similar to traditional light bulbs, except that they fit directly into an electrical circuit. LED's do not have a filament, so they generally last for a long, long time without burning out. Because there is no filament, LED's do not get hot and require far less electric power than traditional light bulbs due to their efficiency. In fact, LEDs are illuminated by electrons that run through the semiconductor material that LEDs are connected to.

What is a Diode?

An LED is a light emitting diode. A semiconductor diode is a two-terminal device, sometimes described as a pn. An LED is fabricated from a semiconductor material. One side of the semiconductor is attached to the P side which is the anode; the other side of the semiconductor is attached to the N side, the cathode. Electricity can flow from the p side to the n side. However, no electricity can flow in reverse. In effect, therefore, a diode is a unidirectional conductor.

Components of an LED Light

Common components of an LED include: A whisker which is connected to the anode, the anvil, which is connected to the cathode, a lens to illuminate the light created for distances and a high impact plastic casing to protect the LED.

The Color of an LED Light

LEDs are available in a variety of colors. While popular colors include red, yellow and green, one of the most difficult colors to create is white. In fact, it is currently not possible to create pure white for mass production. Most LED flash lights or light bulbs today that are white in color are actually not pure white, but whitish-blue.

LEDs Offer Many Benefits

There are many reasons why LED Light bulbs continue to be popular. Here are some of the main benefits they offer:
  • LEDs are extremely efficient and require very little current to illuminate. Since they do not have a filament, LEDs don't heat up, making them perfect for many electronic applications where heat is detrimental. In a traditional light bulb, the vast majority (sometimes more than 80%) of the electricity used to illuminate a light bulb is wasted not in light, but in heat.
  • LEDs are manufactured within an epoxy resin epoxy, which means that that they are virtually indestructible. Compared to a traditional light bulb, an LED is far more durable.
  • LEDs can be mass produced. Just like traditional light bulbs, they are extremely affordable to produce in large numbers.
  • LEDs are considered to be solid state devices. Solid state refers to any item that has no moving parts. When an item has no moving parts, it is generally more reliable because of less friction and fewer parts that can malfunction.