It is said the LED reduces the lighting power. How? What is the mechanism ?
What is LED?
The light-emitting diode (LED) is one of today's most energy-efficient and rapidly-developing lighting technologies. Quality LED light bulbs last longer, are more durable, and offer comparable or better light quality than other types of lighting. Check out the top 8 things you didn't know about LEDs to learn more.
Characteristics of LED
LED lighting is very different from other lighting sources such as incandescent bulbs and CFLs. Key differences include the following:
- Light Source: LEDs are the size of a fleck of pepper, and a mix of red, green, and blue LEDs is typically used to make white light.
- Direction: LEDs emit light in a specific direction, reducing the need for reflectors and diffusers that can trap light. This feature makes LEDs more efficient for many uses such as recessed downlights and task lighting. With other types of lighting, the light must be reflected to the desired direction and more than half of the light may never leave the fixture.
- Heat: LEDs emit very little heat. In comparison, incandescent bulbs release 90% of their energy as heat and CFLs release about 80% of their energy as heat.
Read Further: https://energy.gov/energysaver/led-lighting
LED lighting is Light-emitting diodes (LEDs). They are solid state semi conductor devices. This has advanced from use in numeric displays and indicator lights to a range of novel applications like exit signs, traffic lights, signage,outdoor lighting, accent lighting, down lighting etc LED illumination is achieved when a semiconductor crystal is excited to directly produce visible light in a desired wavelength range.
It is a fact that LEDs offer many benefits like small size, long lamp life, energy saving and durability etc. It is available in desired shapes,colours,sizes and lumen -it can be designed in colour changing, dimming etc.
Following are significant characteristics of LED
1.When a LED is activated power supply converts AC voltage into sufficient DC voltage which is applied across the diode semiconductor crystal , excess energy is converted into light
2. The use of indium gallium nitride ( InGaN) as semi conductor material has resulted in the brightest LEDs and developed white LED
3.LEDs produce efficacies lumen/whatt greater than incandescent lamps and they are low voltage low current devices and
4. Colour with LED is possible based on chemical composition of material being excited. It can produce white,deep blue, yellow,green,orange,red,bright red and deep red.
This is in addition to answer given by Harry Barton Essel. His answer is recommended by me
Thank you very much for answers - Harry Barton Essel and Dr K N Sheth Sir
Almost the matter is clear now.
- LEDs are pn junctions usually made from direct bandgap semiconductors(Ex: GaAs) .
- Direct hole pair (EHP) recombination results in emission of a photon.
- Photon energy is approximately equal to the bandgap energy; Eg= hc/(wavelength)
A light-emitting diode (or "LED") is a light source made of semiconductor materials that emit light when an electric current passes through it. It is frequently used as a more commonly called LED or as a "wavy" lighting fixture.
For example, if a normal bulb power of a 25-watt tungsten strand is powered by an LED lamp, it can only be replaced by a 4-watt power, although each produces a high intensity Light up to 190 lumens.
LEDs are produced between 4 watts to 100 watts.
The Nobel Prize in Physics was awarded to inventors of the photovoltaic diode, Isamu Akasaki, Hiroshi Amano and Shoji Nakamura for "the invention of the blue light emitting diode, which has led to the possibility of providing bright and energy-efficient sources of white light."
You can take advantage of the following link: https://ar.wikipedia.org/wiki
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