Sep 09, 2017

Electric Bulb: Since invention till now.
Sep 09, 2017
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Electric Bulb, also known as the Incandescent light bulb wasn't invented by Thomas Alva Edison in 1879.

  • It was initially invented by Humphry Davy in 1802, but it wasn't much brighter for practical use. Later it was improved periodically by more than 10 peoples including Edison.
  • Edison version of Electric Bulb was far better than the earlier versions because of a combination of three factors: an effective incandescent material, a higher vacuum than others and a high resistance.
  • In 1878, Thomas Edison began serious research into developing a practical incandescent lamp. After failing and testing several metal filaments, he files U. S. patent for an electric lamp granting that he discovered a carbonized bamboo filament could last over 1200 hours.
  • This discovery marked the beginning of commercially manufactured light bulbs and in 1880, His company, Edison Electric Light Company began marketing its new product. 


  • After trying several metal filaments, Edison ended up successfully on carbon filament.
  • In 1904,  Sándor Just and Franjo Hanaman were granted a Hungarian patent (No. 34541) for a tungsten filament lamp.
  • Since then, Electric Bulbs were started to fill with the inert gas such as argon or nitrogen to slow the evaporation rate of the tungsten filament compared to vacuum.
  • Underhill, located in Gateshead, United Kingdom was the first house to be lit by electric lights.
  • In 1881, the Savoy Theatre, London was the first public building in the world, to be lit entirely by electricity.
  • Mosley Street, Newcastle upon Tyne, United Kingdom was the first street to be lightened by an incandescent light bulb.
  • 95% of the power consumed by typical incandescent light bulbs converted into heat energy instead of visible light. So there is a huge amount of electricity wasting through it.
  • As time passed electric bulb improved through energy consuming (Incandescent light bulbs) to energy-efficient lighting alternatives like Fluorescent lamp, Compact fluorescent lamp (CFL), light-emitting diode (LED)
  • Started by Brazil and Venezuela since 2005, countries like Canada, Mexico, Chile and Colombia applied a full ban on Incandescent light bulbs, In favour of more energy-efficient lighting alternatives.
  • While China, Russia, European Union, US, Australia and South Africa applied a partial ban on Incandescent light bulb. 
  • In India, Government plans to replace all 770 million Incandescent light bulb with LED bulbs by 2019 under UJALA scheme.