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 2016, 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 ?
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.
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 this technique, high-speed information can be transmitted from an LED lightbulb.
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.
Now the Middle Kingdom light-masters used a single one-watt LED lightbulb with a signal modulation chip to send data to four PCs at 150Mbps.
Repeated exposure to blue light at night, emitted by the TV set, electronic gadgets and the energy-efficient LED lightbulbs, may cause some long-term harm.
Energy-efficient lighting: Lighten up the work load for maintenance staff by swapping regular lightbulbs for LED lightbulbs.
When choosing LED lightbulbs, check out the warmer/cooler labels and go for bulbs that are nearer the blue scale.
In cooperation with Etihad Energy Service Company (ESCO), DEWA will replace traditional light bulbs with LED lightbulbs in 500 villas, located in Al Barsha, Al Warqa, and Oud Metha.
GE has a new line of LED lightbulbs, simply called "C," that can be directly controlled with a smart-phone or tablet via Bluetooth; no central hub necessary.
Like LED lightbulbs, giant pandas are energy-saving superstars.
These include 'green' meetings packages with naturally-lit rooms, paperless solutions and sustainable food choices at Movenpick Hotel Jumeirah Lakes Towers in Dubai, to LED lightbulbs, motion-sensor light timers and special water faucets at Movenpick Hotel & Resort Al Bida'a Kuwait.