The light bulb is the most important invention in history. This invention helps in many ways, the most important:; it helps us see when we can't, especially at night. The light bulb is an invention used all the time. The light bulb has impacted the world in a variety of ways. The only available source of light was candles, oil lanterns and gas lamps. The creation of the electric light bulb known today was a very long process. Mostly, inventors kept adding different filaments or trying new filaments. It didn't happen all at once, it took several people to keep improving it, until it was the typical light bulb of today. Many people helped with the light bulb we know today. The following people, Humphry Davy, Warren De La Rue, James Bowman Lindsay, Edward Shepard, Joseph Wilson Swan, Heinrich Goebel, Hermann Sprengel, Henry Woodward, Matthew Evans, Thomas Edison, Willis Whitney, and William David Coolidge were all extraordinary people who helped make the light bulb we have today. A scientific experiment will also be discussed in this essay. In the science experiment, it will show which bulb produces the most heat. The materials that will be used in this experiment will be two light bulbs, a lamp and a thermometer used to measure the heat produced. The two bulbs compared are an incandescent bulb and a fluorescent bulb. The invention of the incandescent light bulb dates back to the 19th century. The only source of light available before the electric light bulb was candles, oil lanterns, and gas lamps (invsee.asu.edu). In 1809, Humphry Davy, an English chemist, began work on the invention of the incandescent light source....... middle of paper ......ilament. It was a predecessor of the tungsten filament. In 1906, the General Electric Company was the first to patent a method. This involved manufacturing tungsten filaments used in incandescent light bulbs. Filaments were very expensive at that time. In 1910, William David Coolidge then invented an improved method of manufacturing tungsten filaments. This has outlasted all other filament types. This filament, unlike that manufactured by the General Electric Company, was much cheaper and affordable to the public. Coolidge made the price practical. Later, in 1925, the first frosted bulbs were produced. Finally, in 1991, Philips, using magnetic induction, invented a light bulb that lasted 60,000 hours (inventors.about.com). Even though many light bulbs were being made, some of them were no longer going to be made or sold in stores..