Before the LED came on board, the incandescent bulbs were used. The incandescent bulbs worked when a tiny metal filament is heated up. These bulbs produce a lot of heat thereby reducing the amount of light generated. A lot of energy is wasted and the lifetime of the batteries is shortened drastically. Another disadvantage of using incandescent bulbs was their inability to generate enough brightness. You could barely see further than a meter from your position.

All these inefficiencies led to a solution. Not too long ago, the LED (Light Emitting Diode) was discovered. LED’s are brighter, durable, more efficient than the incandescent bulbs. They are used in virtually all the rechargeable lights. Rechargeable LED lights have taken the place of the old incandescent flashlights. There is no need calling them the future of lighting technology because they are already in use.

In the case of a LED, the diode emits the light and not a bulb. A diode conducts electrical current in a single direction. In the case of a bulb, the electrical current flows in two directions. A LED has semiconductors and they have a varying ability to conduct electricity. They are two types of semiconductors, the N-Type and the P-Type. The N-Type semiconductor has a lot of electrons and the P-Type has room for more electrons. Electrons are negatively charged tiny particles with atoms. Electricity is generated by the flow of electrons.

The N-type electrons move to the P-type side when electrical current is applied to the diode. Immediately when the electrons fall into one of the holes on the P-type, energy is released. When the electron falls into a hole, the energy that would be released in the cause of this action is called a photon, which is a particle of light.

The flow of electrons – continuously into the hole – produces light, which makes the LED light up. This process doesn’t produce much heat, unlike the incandescent bulb.

The LED can be produced to emit specific wavelengths of light. This would be possible depending on the kind of semiconductor used. A red LED makes use of an aluminum gallium arsenide, a green LED makes use of an aluminum gallium phosphide, while a blue LED makes use of an indium gallium nitride. White LED’s consist of all colors of the rainbow, and it can be made by adding red, green and blue LED’s.

Rechargeable LED lights are now the way to go in the lighting industry. They are long lasting and consume less energy. Incandescent bulbs are rarely used nowadays. The LED is a great innovation that has come to stay and it has been embraced worldwide by manufacturers who produce flashlights and rechargeable lights. It’s amazing how technology improves and you can be sure that it will only get better every day.


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