A bulb-shaped modern retrofit LED lamp with aluminum heat sink, a light diffusing dome and E27 screw base, using a built-in power supply working on mains voltage. A light-emitting diode ( LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy ...

An LED lamp or LED light bulb is an electric light that produces light using light-emitting diodes (LEDs). LED lamps are significantly more energy-efficient than equivalent incandescent lamps and can be significantly more efficient than most fluorescent lamps. [1] [2] [3] The most efficient commercially available LED lamps have efficiencies of ...

A LED display is a flat panel display that uses an array of light-emitting diodes as pixels for a video display. Their brightness allows them to be used outdoors where they are visible in the sun for store signs and billboards. In recent years, they have also become commonly used in destination signs on public transport vehicles, as well as variable-message signs on highways. …

LEd (formerly LaTeX Editor) was a freeware editor for TeX and LaTeX, built for a Microsoft Windows platform. LEd offered a project manager, powerful editor, integrated spellchecker and thesaurus, built-in DVI viewer, descriptive hints for LaTeX commands, code complete mechanism, word wrapping, code folding , multilingual environment, and more.

A light-emitting diode ( LED) is a semiconductor device that produces light from electricity. LEDs last a long time and do not break easily (compared to incandescent lightbulbs ). They can produce many different colors. They are efficient - most of the energy turns into light, not heat.

Alcuni LED di colore rosso. Il diodo a emissione di luce, in sigla LED (dall' inglese light-emitting diode ), [1] è un dispositivo optoelettronico che sfrutta la capacità di alcuni materiali semiconduttori di produrre fotoni attraverso un fenomeno di emissione spontanea quando attraversati da una corrente elettrica .

In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode. The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED. The voltage drop across an LED is approximately constant over a wide range of operating current; therefore, a small increase in …