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An LED lamp LED light bulb is a solid-state lamp that uses light-emitting diodes LEDs as the source of light. The LEDs involved may be conventional semiconductor light-emitting diodes, to organic LEDs OLED, or polymer light-emitting diodes PLED devices, although PLED technologies are not currently commercially available.
Since the light output of individual light-emitting diodes is small compared to incandescent and compact fluorescent lamps, multiple diodes are often used together. In recent years, as diode technology has improved, high power light-emitting diodes with higher lumen output are making it possible to replace other lamps with LED lamps. One high power LED chip used in some commercial LED lights can emit 7,527 lumens while using only 100 watts. LED lamps can be made interchangeable with other types of lamps.
Diodes use direct current DC electrical power, so LED lamps must also include internal circuits to operate from standard AC voltage. LEDs are damaged by being run at higher temperatures, so LED lamps typically include heat management elements such as heat sinks and cooling fins. LED lamps offer long service life and high energy efficiency.
