Product number (P/N): LED as Bulb (Technical Vocabulary),
Keywords/Tags: LED as Bulb (Technical Vocabulary)
Classification: / Technology,
Info: (Extract from WIKIPEDIA):
A Light Emitting Diode (LED) is a two-lead semiconductor light source. It is a basic pn-junction diode, which emits light when activated.
When a fitting voltage is applied to the leads, electrons are able to recombine with electron holes within the device,
releasing energy in the form of photons. This effect is called electroluminescence,
and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor.
An LED is often small in area (less than 1 mm2) and integrated optical components may be used to shape its radiation pattern.
Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared light.
The first visible-light LEDs were also of low intensity, and limited to red. Modern LEDs are available across the visible,
ultraviolet, and infrared wavelengths, with very high brightness.
Early LEDs were often used as indicator lamps for electronic devices, replacing small incandescent bulbs.
Recent developments in LEDs permit them to be used in environmental and task lighting.
LEDs have many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved physical robustness,
smaller size, and faster switching. Light-emitting diodes are now used in applications as diverse as aviation lighting, automotive headlamps,
advertising, general lighting, traffic signals, and camera flashes.
However, LEDs powerful enough for room lighting are still relatively expensive,
and require more precise current and heat management than compact fluorescent lamp sources of comparable output.
On October 7, 2014, the Nobel Prize in Physics was awarded to Isamu Akasaki, Hiroshi Amano and Shuji Nakamura for
"the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources" or, less formally, LED lamps.
Internet: Link-1: WIKIPEDIA