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 2018, 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 ?
Dimming: Many LED bulbs are dimmable, unlike early LEDs and compact fluorescent light bulbs (CFLs), the vast majority of which still are not dimmable.
Pharox Apollo Retrofit LED bulb will be available across India at the MRP of Rs.
Though the scheme for the distribution of LED bulbs was announced by the central government, its distribution and execution are in the hands of the state governments and to be more specific, with the state electricity boards.
Each of these 100-watt replacement LED bulbs uses only 18 watts but gives as much light as a 100-watt incandescent bulb.
So it may be fact that a 60 watt bulb would be brighter than a 30 watt bulb, an LED bulb will produce the equivalent lumens for fewer watts - so don't let this put you off if you are thinking of changing.
The Vinverth Flamber LED bulb comes with a converter, so it can be used anywhere in the world irrespective of the socket type, pin or screw.
Interestingly, it is far more bright in comparison to regular 5W LED bulbs.
Although LED bulbs are coming down in cost, dimmable LEDs are still significantly more expensive than comparable halogen, or even CFL bulbs.
The coming (and staying) of LED bulbs is a case study in how government policy, rightly done, can spur private-sector innovation.
Dimmable" LED bulbs are still hit-and-miss, so I'm reserving judgment (there's a list of compatible dimmers at creebulb.
We believe this breakthrough LED bulb will, for the first time, give consumers a reason to upgrade the billions of energy-wasting light bulbs.
These smart, connected LED bulbs can glow as brightly as an incandescent bulb, utilize a wireless "hub" or base station to establish a network connection (Insteon offers a bulb that also includes a hand held remote), and they allow the user to control the LED bulbs from virtually anywhere via apps on their iOS or Android devices.