16 Facts About Filament lamp

An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows.

Filament lamp stated that he could "read a book at a distance of one and a half feet".

Filament lamp used as a burner two carbon rods of diminished section in a glass receiver, hermetically sealed, and filled with nitrogen, electrically arranged so that the current could be passed to the second carbon when the first had been consumed.

On 24 July 1874, a Canadian patent was filed by Henry Woodward and Mathew Evans for a Filament lamp consisting of carbon rods mounted in a nitrogen-filled glass cylinder.

In 1882 Munich Electrical Exhibition in Bavaria, Germany Cruto's Filament lamp was more efficient than the Edison's one and produced a better, white light.

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On 18 December 1878, a Filament lamp using a slender carbon rod was shown at a meeting of the Newcastle Chemical Society, and Swan gave a working demonstration at their meeting on 17 January 1879.

Filament lamp devised a method of treating cotton to produce 'parchmentised thread' in the early 1880s and obtained British Patent 4933 that same year.

Main difficulty with vacuumizing the lamps was moisture adsorbing to the glass inside the bulb, which, if not removed, split when the lamp was lit, with resulting oxygen attacking the filament.

Since tantalum metal has a lower resistivity than carbon, the tantalum lamp filament was quite long and required multiple internal supports.

On 13 December 1904, Hungarian Sandor Just and Croatian Franjo Hanaman were granted a Hungarian patent for a tungsten filament lamp that lasted longer and gave brighter light than the carbon filament.

Filament lamp temperatures depend on the filament type, shape, size, and amount of current drawn.

Filament lamp notching is due to uneven evaporation of the filament.

Halogen lamp reduces uneven evaporation of the filament and eliminates darkening of the envelope by filling the lamp with a halogen gas at low pressure, along with an inert gas.

The halogen lamp can operate its filament at a higher temperature than a standard gas filled lamp of similar power without loss of operating life.

Variation of the incandescent lamp did not use a hot wire filament, but instead used an arc struck on a spherical bead electrode to produce heat.

Relationships above are valid for only a few percent change of voltage around standard rated conditions, but they indicate that a Filament lamp operated at low voltage could last much longer than at rated voltage, albeit with greatly reduced light output.