Light bulb

LeeF….Living in the Light..Driving with the Wind..

We are a young entity with strategy based on our core competence, Engineering and the change we foresee in households and industries, Innovation. Within a short time we have invested in major interests of the general public, conserving energy to particular needs of interest groups, ground braking designs. Our visions lie with sustainable energy and consumer electronics. Creative Thinking, Practical Innovations, Quality Standards and Customer Empowerment approach govern our objectives. Crafting our technology into the grasp of every house hold and embedding innovation as agents of efficiency, quality and class is our special skill. We believe in team work, commitment, and constant improvement to realize the wildest dreams of our customers.

Wednesday, October 17, 2012

Now LeeF Reaching closer to you



 
LeeF LED lamps are conquering the lighting industry, providing best solution to your lighting requirements. Now LeeF is out there in WWW, conquering the web, reaching you easier than ever before.
 
leef.lk was released to cyber space, today, 15th October 2012 at the official web launch in a gathering of the company shareholders held within the premises of University of Moratuwa. The website was launched at 11.00 a.m. by the president of LeeF, Rishan Akalanka after the IT director Chamika Kasun officially addressed the gathering on the .lk domain.
 
The website includes the basic information of the organisation, the product details and pictures, the services offered and contact information. The web site is equipped with newest technology to enhance capabilities and user friendliness.   It is the result of the hard work of LeeF IT initiative spearheaded by IT director Chamika Kasun and his crew.
  
All the LeeF product details and services are now available just for you all at one place at your finger tips. Visit us today and experience the LeeF technology.
 
Visit us at www.leef.lk and Feel the belief.

Wednesday, October 10, 2012

LIGHT emitting DIODES - LIFE enlightening DIODES



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……..

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 visibleultraviolet, 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…….