LIGHT emitting DIODES - LIFE enlightening DIODES
It is with a bit of an exaggeration I started conglomerating
my ideas. LED s just another invention? I don’t think so…There are thousands of
points to contradict the idea, millions of examples to eradicate this idea, but
thirty engineers to eliminate this misconception and root the contemporary
innovation of LED bulbs to enhance the development of the LED s……..
A
light-emitting diode (
LED) is
a
semiconductor light source. LEDs are
used as indicator lamps in many devices and are increasingly used for
other
lighting.
Appearing as practical electronic components in 1962, early LEDs emitted
low-intensity red light, but modern versions are available across the
visible,
ultraviolet,
and
infrared wavelengths,
with very high brightness.
So the year 1962 brought a different kind of experience to
those who wanted to minimize the concept of lighting, and this special day was
the 9th of October. So the 9th of October brings foliage
of refreshing memories to those who are engaged in the industry of LED lamps.
LeeF being one of those exclusive companies, would like to
relish the memories of everybody who are interested in LEDs. The history states……
“The first known report of a light-emitting solid-state diode was made in 1907
by the British experimenter H. J. Round. However, no practical use was made of
the discovery for several decades. Independently, Oleg Vladimirovich Losev
published "Luminous carborundum [[silicon carbide]] detector and detection
with crystals" in the Russian journal Telegrafiya i Telefoniya bez
Provodov (Wireless Telegraphy and Telephony). Losev's work languished for decades.
The first practical LED was invented by Nick Holonyak, Jr., in 1962 while he
was at General Electric Company. The first LEDs became commercially available
in late 1960s, and were red. They were commonly used as replacements for
incandescent indicators, and in seven-segment displays, first in expensive
equipment such as laboratory and electronics test equipment………….
|
Nick Holonyak |
But today the world revolves in a complete different way in
which most of the tiny, One thing for sure, when we list down the applications
of LED, you will be mesmerized, but it is true……
- Architectural lighting
- Status indicators on all sorts of equipment
- Traffic lights and signals
- Light source for machine vision systems,
requiring bright, focused, homogeneous and possibly strobed illumination.
- Exit signs
- Motorcycle and Bicycle lights
- Toys and recreational sporting goods, such as
the Flashflight
- Railroad crossing signals
- Continuity indicators
- Flashlights, including some mechanically powered
models.
- Light bars on emergency vehicles.
- Elevator Push Button Lighting
- Thin, lightweight message displays at airports
and railway stations and as destination displays for trains, buses, trams and
ferries.
- Red or yellow LEDs are used in indicator and
alphanumeric displays in environments where night vision must be retained:
aircraft cockpits, submarine and ship bridges, astronomy observatories, and in
the field, e.g. night time animal watching and military field use.
- Red, yellow, green, and blue LEDs can be used
for model railroading applications
- Remote controls, such as for TVs and VCRs, often
use infrared LEDs.
- In optical fiber and Free Space Optics
communications.
- In dot matrix arrangements for displaying
messages.
- Glowlights, as a more expensive but longer
lasting and reusable alternative to Glowsticks.
- Grow lights composed of LEDs are more efficient,
both because LEDs produce more lumens per watt than other alternatives, and
also because they can be tuned to the specific wavelengths plants can make the
most use of.
- Movement sensors, for example in optical
computer mice
- Because of their long life and fast switching
times, LEDs have been used for automotive high-mounted brake lights and truck
and bus brake lights and turn signals for some time, but many high-end vehicles
are now starting to use LEDs for their entire rear light clusters. Besides the
gain in reliability, this has styling advantages because LEDs are capable of
forming much thinner lights than incandescent lamps with parabolic reflectors.
The significant improvement in the time taken to light up (perhaps 0.5s faster
than an incandescent bulb) improves safety by giving drivers more time to
react. It has been reported that at normal highway speeds this equals 1 car
length increased reaction time for the car behind.
- Backlighting for LCD televisions and displays. The
availability of LEDs in specific colors (RGB) enables a full-spectrum light
source which expands the color gamut by as much as 45%.
- New stage lighting equipment is being developed
with LED sources in primary red-green-blue arrangements.
- Lumalive, a photonic textile
- LED-based Christmas lights have been available
since 2002, but are only now beginning to gain in popularity and acceptance due
to their higher initial purchase cost when compared to similar
incandescent-based Christmas lights. For example, as of 2006, a set of 50
incandescent lights might cost $2.00 USD, while a similar set of 50 LED lights
might cost $10.00 USD. The purchase cost can be even higher for single-color
sets of LED lights with rare or recently-introduced colors, such as purple, pink
or white. Regardless of the higher initial purchase price, the total cost of
ownership for LED Christmas lights would eventually be lower than the TCO for
similar incandescent Christmas lights[citation needed] since an LED requires
much less power to output the same amount of light as a similar incandescent
bulb.
- LED phototherapy for acne using blue or red LEDs
has been proven to significantly reduce acne over a 3 month period.[citation
needed] as a medium quality voltage reference in electronic circuits. The
forward voltage drop (e.g. about 1.7 V for a normal red LED) can be used
instead of a Zener diode in low-voltage regulators. Although LED forward
voltage is much more current-dependent than a good Zener, Zener diodes are not
available below voltages of about 3 V.
- Computers, for hard drive activity and power on. Some custom computers feature
LED accent lighting to draw attention to a given component. Many computer
manufactuers use LEDs to tell the user its current state. One example would be
the Mac, which tells its user when it is asleep by fading the LED activity
lights in and out, in and out.
- Lanterns
- All these
were appreciating the capacity of LED in new electronic devices, but LeeF
uniquely sings songs of praise, as LEDs showed us the path to envisage the new
trend and generation of lighting, the traditional incandescent equipped with a
cluster of LEDs,
- We
accentuated the real capability of LEDs to bring light to the world under
maximum power saving conditions and mercury free environment…….
So be proud and say…LEDs are no more
Light emitting diodes but LeeF Enlivened
Diodes…
And
it is with so much of pleasure that the LeeF company wishes the LED a happy 50th
birthday…….