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In 1907 cheap air max 270 womens , H. J. Round, a researcher at Marconi laboratories, discovered the electroluminescence phenomenon by using a crystal of carbon and silica and a primitive detector made from a semi-conductive metal. From that point to the modern LED PL lamp, there is a century of improvements and innovations brought by scientists all over the world.

The Russian Oleg Vladimirovich Losev was the one who created the first LED around 1920. Everybody was excited about his discovery, but because the light obtained by this method was too weak cheap air max 270 , no one seemed to find its utility. It was only in 1961 that Bob Biar and Gary Pittman discovered that, by applying an electrical current to a gallium arsenide, they could obtain an infra-red light.

In the next year, Nick Holonyak made the first red LED PL Lamp system, while he was working at an electricity company. The color and the intensity of the light depended on the composition of the semi-conductor metal. The next step was to make the first yellow LED PL Lamp air max 720 mens sale , and ever since that day till now, when there are so many types of colored LEDs, almost every year meant a step forward.

Initially, LED lights were too expensive to be used on a large scale, but in 1968 cheap air max 720 mens sale , the Monsanto Corporation was the first company that started to mass produce LEDs. Later, Monsanto was bought by a computer company and the LEDs were integrated in the alphanumeric computers. For a while, they were used just as indicators in the expensive equipment, in order to replace the incandescent lamps.

From those computer displays, which were able to show a single letter cheap nike air max 720 mens , to the animated displays of our days, and, furthermore to walls of LED lamps displays, which can re-create intricate images and movements, graduate colors and shades cheap air max 720 mens , the step was a huge one, made in a short period of time - approximately 30-40 years of research and evolution.

The first LED PL Lamp system that could be used to produce light was made by Shuji Nakamura in 1993 with an In-Ga-N alloy. In 2006 Nakamura was awarded the Millenium Technology Prize for his achievement. Nakamura's LED had the color blue and, when combined with the yellow one invented by Dr. M. George Craford in 1971, a white light could be made, similar to the light given by the incandescent bulbs.

In 2008 air max 720 womens sale , the most powerful LED light to that day was made by a South-Korean manufacturer. The company was able to produce a record 900 lumen at 10 watts, 90 lumens watt - almost the same as a 75 watt light bulb. Two years later, a Japanese firm created a prototype of another powerful LED reaching 120 lumen watt and, soon after, another company announced that they made a prototype that can obtain 208 lm watt.

This rapid evolution of almost 100 years allows us to suppose that cheap air max 720 womens sale , in a short period of time, we will all live in houses and work in offices that will use the LED PL lamp system as main light emitter.


Top Brands Of Tennis Shoes Sports Articles | March 2, 2009
With tennis becoming one of the most popular sports around the world the shoe market is flooded with various brands of tennis shoes manufacturers today.

With the growing popularity of tennis, many sports equipment manufacturers have entered into the shoes market with innovative styles of tennis shoes. Tennis is a highly strenuous sport. Hence a good pair of tennis shoes is a must for quality performance from the player. Good branded tennis shoes are made with reinforced heel and toe pads as these areas are most prone to wear and tear during games.

A game of tennis can be played on hard court and clay court. Tennis shoes are also available as per different ground surfaces. For instance, tennis shoes meant for hard court surfaces ought to be durable and extra protective where as for soft court surfaces tennis shoes are designed to provide maximum comfort to the players.

Buying branded tennis shoes provide good return in the long run both in terms of performance and durability. Today market is flooded with many brands of tennis shoes. Before buying cheap nike air max 720 womens , it is suggested to do a thorough market analysis of different brands of tennis shoes so as to know the high and low points of the brands. A brief discussion on some of the top branded tennis shoes as discussed as follows to help you choose your tennis shoes.

Nike:

Nike, one of the most popular names in tennis shoe market, has dominated the market since the 80`s. Popular sports stars from different fields like Tiger Woods, Michael Jordan and Lebron James endorse for this brand of shoes. The superstar studded endorsement has catapulted the status of Nike brand of shoes.

Latest technology has been adopted in the Nike brand of shoes. Nike tennis shoes now are designed in such a way so as to bring in air to the soles. This latest feature makes the tennis shoe very comfortable. In fact this feature has brought Nike as a forefront innovator in the tennis shoe market. One of its most popular shoes `Air Jordan` is a signature shoe by Michael Jordan. With the latest technology used for shoes designs and prominent sports persons endorsing its products, a basic Nike shoe doesn`t come with a price lower than $300.

Reebok:

Reebok brand always gives emphasis to serious gamers. It`s a common sight to watch NBA players wearing Reebok brands during NBA games. Several young tennis stars also endorse for this brand of tennis shoes. Over the years Reebok has introduced many advanced technologies such as the DMX technology and Supportive CMEVA midsole to provide ultimate cushioning comfort to the players and enable easy movement in and around the court. One popular brand of tennis shoes for women has also been designed by famous Hollywood actress Scarlett Johansson. Price wise cheap air max 720 womens , Reebok brand of tennis sh. Cheap Soccer Jerseys From China Cheap NHL Jerseys From China Cheap Youth NBA Jerseys Cheap MLB Jerseys Wholesale Wholesale Jerseys Cheap Adidas NHL Jerseys Cheap NFL Jerseys Wholesale Cheap Nike NFL Jerseys From China Cheap College Jerseys China Cheap Nike NBA Jerseys