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Christmas lights - Wikipedia

Christmas lights (also known as fairy lights) are lights used for decoration in celebration of Christmas, often on display throughout the Christmas season including Advent and Christmastide. The custom goes back to when Christmas trees were decorated with candles, which symbolized Christ being the light of the world ; [1] these were brought by Christians into their homes in early modern Germany .

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LED Lights - How it Works - History - Edison Tech Center

The LED is a light source which uses semiconductors and electroluminescence to create light. There are two major kinds of light emitting diodes: LED and OLED . The LED is different than EL lamp in that it uses a small semiconductor crystal with reflectors and other parts to make the light brighter and focused into a single point.

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Learn About LED lights | ENERGY STAR

Common LED colors include amber, red, green, and blue. To produce white light, different color LEDs are combined or covered with a phosphor material that converts the color of the light to a familiar "white" light used in homes. Phosphor is a yellowish material that covers some LEDs.

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Light-emitting diode - Simple English Wikipedia, the free ...

Light-emitting diode. An LED is a type of diode that makes one color of light when electricity is sent through it in the expected direction ( electrically biased in the forward direction). This effect is a kind of electroluminescence. The color of the light depends on the chemical composition of the semiconducting material used,...

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Light-emitting diode - Wikipedia

LEDs constitute a nearly ideal light source for machine vision systems for several reasons: The size of the illuminated field is usually comparatively small and machine vision systems are... LED elements tend to be small and can be placed with high density over flat or even-shaped... LED lights ...

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Automotive lighting - Wikipedia

Rear position lamps (tail lamps) Conspicuity for the rear of a vehicle is provided by rear position lamps (also called tail lamps or tail lights ). These are required to produce only red light and to be wired such that they are lit whenever the front position lamps are lit, including when the headlamps are on.

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LED circuit - Wikipedia

LED circuit. In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). 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...

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Grow light - Wikipedia

LED grow lights are composed of light-emitting diodes, usually in a casing with a heat sink and built-in fans. LED grow lights do not usually require a separate ballast and can be plugged directly into a standard electrical socket. LED grow lights vary in color depending on the intended use.

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LED lamp - Wikipedia

LED lamp. A LED lamp or LED light bulb is an electric light for use in light fixtures that produces light using light-emitting diode (LED). LED lamps have a lifespan and electrical efficiency which are several times greater than incandescent lamps, and are significantly more efficient than most fluorescent lamps,...

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LED strip light - Wikipedia

LED strip light. An LED Strip Light (also known as an LED tape or ribbon light) is a flexible circuit board populated by surface mounted light-emitting diodes (SMD LEDs) and other components that usually comes with an adhesive backing. Traditionally, strip lights had been used solely in accent lighting, backlighting, task lighting,...

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