A light-emitting diode is a diode that emits light even if there is no voltage between the input and the diode. When a current flows through the diode, electrons in the diode recombine with oxygen or nitrogen vacancies, releasing energy as photons. Photons have an energy level that changes depending on the type of atom they are surrounding. Light-emitting diodes are used in many types of electronic devices to create light.
A diode can be designed to make light by controlling the current to produce either a pulse of light (pulse width modulation) or a continuous flow of light (noise response). The most common of the light-emitting diodes are the LED, which are used in everything from outdoor lighting to in the body scanners found in airports. LED’s have already won many awards and continue to gain popularity as the devices with the most benefits for electricity savings.
LEDs come in a variety of colors including red, blue, yellow-green and white. The yellow-green is the most widely used and efficient as it is the only color in the visible light-emitting spectrum. This is due to the fact that the yellow-green generates the most light per watt when an LED is operating at its most efficient level (at least 75% of its maximum potential). The other colors are more expensive but are more efficient and can be used together with the yellow-green to improve output. The other colors are better suited for use in applications where a lower output level is desirable such as in a night vision LED.https://www.youtube.com/embed/Hl4v1aUFWrs