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 is to reduce consumer concerns about efficient light bulbs due to variable quality of products. Those CFLs with a recent Energy Star certification start in less than one second and do not flicker. Energy Star Light Bulbs for Consumers is a resource for finding and comparing Energy Star qualified lamps. In 2011, Republican House members introduced a Better Use of Light Bulbs Act or BULB Act (H.R. 91), which would have repealed Subtitle B of Title III of the Energy Independence and Security Act of 2007. H.R. 2417 failed to pass in the U.S. House. On 16 December 2011, the