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The light bulb is a great invention of human beings to conquer the night. Nineteenth Century years ago, people used oil lights, candles and so on to light, although it has broken through the night, but still failed to completely liberate mankind from the restrictions of the night. Only the birth of the generator, makes the human to use with a variety of light to make the world shine, turn night into day, and expanding the scope of human activities, to win more time to create wealth for society really invented the electric light, the big bright the is Thomas Edison, American inventor. He is a railway worker's child, elementary school did not read the school, on the train to sell newspapers to survive. Edison is a very hard - working people, like to do a variety of experiments, produced a lot of clever machinery.

He on electrical appliances particularly interested in since the invention of motor Faraday, Edison was determined to make the lamp, for human and bringing light Edison in conscientiously sum up the previous manufacturing lamp failure experience, to develop a detailed test plan issued, respectively in the two aspects of test: 1600 kinds of classification tests of different heat-resistant material; the second is improved apparatus for evacuation, make the light bulb has a high vacuum degree. He also of new generators and circuit shunt systems such as the Edison research will more than 1600 kinds of heat-resistant light emitting material one by one to test down, except white gold of energy, but platinum prices were prohibitively expensive must find a more suitable material to replace the. In 1879, after many experiments, Edison finally decided to use carbon wire to make the filament. He had a length of silk and cotton strewn with carbon powder, bent into a horseshoe shaped, loaded into the crucible heating, made of filament, into the lighting, and then pump pumping to the air in the bulb, bright lights, and the unexpectedly to 45 hours of continuous use. In this way, the world's first carbon filament incandescent lamp came out.

New year's Eve 1879, Edison electric light company where to Menlo Park street lights to develop lamp, Edison in the laboratory often work a day more than a dozen hours, sometimes continuous for several days on a test, the invention of silk carbon filament, he tested a series of 6000 kinds of plant fiber, the selection of bamboo, through the high-temperature sealed furnace burning, re processing, get the carbonized bamboo filaments, fitted to the lighting, once again raise the degree of vacuum bulb, lamp went so far as 1200 hours continuous lighting. The invention of the electric light, had to make gas shares within 3 days plunged 12 percent after the Edison, 1909, the Ke and odd invented with tungsten instead of carbon filament, make the light efficiency surge. Since then, a new step lamp,halogen lamp,fluorescent light fixture and lamp of every hue like bamboo shoots after a spring rain on stage lighting.