Incandescent light bulb granted a Hungarian patent (No. 34541) for a tungsten filament lamp that lasted longer and gave brighter light than the carbon filament. Tungsten filament lamps were first marketed by the Hungarian company Tungsram in 1904. This type is often called Tungsram-bulbs in many European countries. Filling a bulb with an inert gas such as argon or nitrogen slows down the evaporation of the tungsten filament compared to operating it in a vacuum. This allows for greater temperatures and therefore greater efficacy with less reduction in filament life. In 1906, William D. Coolidge developed a method of making "ductile tungsten" from
Phase-out of incandescent light bulbs government departments, public sector undertakings, various boards, cooperative institutions, local bodies, and institutions running on government aid. Japan will phase out incandescent light bulbs and fluorescents by 2020. Kazakhstan banned all bulbs over 25W on 1 January 2014. As of 1 August 2017, Kuwait has banned the import of incandescent light bulbs, including halogen bulbs. It was reported in 2012 that Malaysia would ban incandescent bulbs by 2014. North Korea reportedly made LED bulbs mandatory in 2014 in order to alleviate its energy crisis. In February 2008, president Gloria Macapagal Arroyo called for a ban of incandescent light bulbs by