LED bulb

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LED bulb

A light source that is created by a light emitting diode (LED). For decades, LEDs have been used as indicator lights on myriad products; however, starting in the 2000s, they began to replace incandescent, halogen and fluorescent bulbs. LEDs draw considerably less power and are up to 80% more efficient. Although claims are made for some bulbs lasting 25 years, one should expect a long lifespan under normal usage.

In Their Infancy
As of 2019, LED bulbs are still more expensive than incandescent bulbs; however, prices are constantly decreasing. Companies continue to experiment with numerous designs. For example, when red, green and blue LEDs are combined, they produce white light. Another method uses a blue LED and yellow or red phosphors.

New Lights - A Different Power Source
As incandescent bulbs are replaced with LED bulbs using the same Edison screw mount, the LED bulb must include AC to DC conversion. However, if the bulb's power source is DC such as from powered Ethernet, they are more efficient (see PoE and Edison base). See incandescent bulb, halogen bulb, fluorescent bulb, Acandescent bulb, OLED lighting and LED.

Incandescent vs. LED
The LED bulb on the right draws 3.5 watts but delivers the same brightness as the 45-watt bulb on the left. This LED bulb casts a very white light; however, LED bulbs run the gamut from warm yellow to white-blue (see color temperature).

They Sure Are Weird Looking
This Philips LED bulb hardly resembles incandescent lighting, which has been used for more than a century.

LED Night Light - 23 Times Less Power
Instead of the 7 watt incandescent bulb in the typical night light, this LED uses 0.3 watts. The blue arrow points to the single LED; the red arrow shows the light sensor.
References in periodicals archive ?
LED stands for light-emitting diode and when compared to a regular incandescent lightbulb, an LED lightbulb is more efficient as it can use only one-fifth of energy to produce the same amount of brightness.
The joy comes from encircling in a ring of red permanent Sharpie the date of July 12, wherein you have a chance to come away from the ballpark enjoying not just the lingering afterglow of a Rockies victory but clutching a free LED lightbulb from Xcel Energy.
By luck, the week before I started working from home, I purchased an LED lightbulb that boasts having 64,000 shades of white.
Professor Harold Haas of the University of Edinburgh, another pioneer in LiFi, has said that potentially every LED lightbulb could become part of a LiFi network.
An LED lightbulb is a semi-conductor light source, meaning that the constant current of electricity supplied to an LED lightbulb can be dipped and dimmed, up and down at extremely high speeds, without being visible to the human eye.
Whether it's a smart TV or a smart LED lightbulb, the interactivity--not only human-to-device, but also device-to-device--is here to stay and evolve.
* Using a battery and an LED lightbulb, demonstrate to your students how touching the electrodes (the wires sticking out of the bulb) to the sides of the battery lights the bulb.
"Wherever there is an LED lightbulb, there is an Internet signal," Chi Nan, an information technology professor with Shanghai's Fudan University told Xinhua.
Using this technique, high-speed information can be transmitted from an LED lightbulb.
In comparison with its incandescent and fluorescent predecessors, LED lightbulbs enjoy a longer lifespan.
Will our 25-year LED lightbulbs be obsolete in 10 years when another new technology comes along?
Go for energy-efficient LED lightbulbs and renewable energy sources.