Although it is commonly believed that Thomas Alva Edison invented the incandescent light bulb, he actually just improved on light bulbs detailed in a 1875 patent he bought from two other inventors, Henry Woodward and Matthew Evans.
The initial cost of an incandescent bulb is small when compared to the cost of the energy it will use over its lifetime. Since the incandescent light bulb uses more energy than alternatives, such as LED lamps and CFLs, several governments have tried to bring about measures in banning their use.
An incandescent light bulb is made of an airtight enclosure, known as the bulb, with a filament of tungsten wire inside the bulb through which an electric current is passed. Contact wires and a base with two or more conductors are what provide electrical connections to the filament. The electric current within a light bulb will heat the filament to several thousand degrees Fahrenheit, but that temperature is still far lower than the melting point of tungsten.
Of the emitted energy from an incandescent light bulb, most is given off as heat, rather than light.
The length of a light bulb's life has increased greatly since it was first invented. In fact, In 1991, Philips invented a light bulb that lasts 60,000 hours and uses magnetic induction.