A light-emitting diode (LED) is a light source that emits light when an electrical current is applied to it. Discovered in the early 20th century, the technology has been greatly developed and continues to advance through research and development. From early indicator lights with low light output--with only one available color--to today's devices that emit visible, ultraviolet or infra red light, with very high brightness.
The technology behind LED is based on semiconductor technology, which is also the basis of modern computers. In the semiconductor diode, electrons are brought from a state of high energy to a state of low energy state and this energy difference is emitted in the form of light, the effect is called electroluminescence.
LED products still remain relatively expensive, and have some characteristics that differentiate them from traditional light sources, such as need for current- and heat management. These advantages have caused LEDs to be used in many new applications where traditional light sources could not be used, as well as traditional applications where especially the low energy consumption is appreciated. Despite high price and the need for specialized design, LEDs are seeing adoption in more and more areas of lighting.
The first commercial LEDs were commonly used as replacements for incandescent indicators, and in seven-segment displays, first in expensive equipment such as laboratory and electronics test equipment, then later in such appliances as TVs, radios, telephones, calculators, and even watches. These red LEDs were bright enough only for use as indicators, as the light output was not enough to illuminate an area. Later, other colors became widely available and also appeared in appliances and equipment. As the LED materials technology became more advanced, the light output was increased, while maintaining the efficiency and the reliability to an acceptable level. The invention and development of the high power white light LED has led the application to general illumination.
LED Lighting is a successful alternative to incandescent in both commercial and residential lighting applications because these lights are extremely energy-efficient, hold long lives, small in size, generate relatively less heat, have a sluggish failure rate, are shock resistant, work glowing in low temperatures, their beam can be effortlessly focused, and they have no toxic mercury contrasting today.
Vena Technologies, LLC
Tel: 724-823-8062
560 McKean Avenue
Donora, PA 15033