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40- & 60-watt bulbs

The 40- & 60-watt bulbs are traditional incandescent light bulbs that have been used for over a hundred years throughout the world as a primary light source. These bulbs produce light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. The hot filament is protected from oxidation with a glass or quartz bulb that is filled with inert gas or evacuated. The light bulb is supplied with electrical current by feed-through terminals or wires embedded in the glass. Most bulbs are used in a socket which provides mechanical support and electrical connections.

Compared to modern LEDs and fluorescents, the 40- & 60-watt bulbs produce warm lights that are more pleasant and comforting to the eye. Unfortunately, these old incandescent bulbs are highly inefficient — only about 10 percent of their energy output is converted into light; the rest is lost to heat. Some studies have suggested that U.S. consumers would save $13 billion and 30 large coal-burning power plants-worth of electricity a year once all of the nation's 4 billion incandescent light bulbs have been replaced with more energy efficient lights.

On Jan. 1, 2014, the standard incandescent 60- and 40-watt light bulbs are permanently banned to comply with efficiency standards outlined in the Energy Independence and Security Act, which was signed into law by President George Bush in 2007. The 75- and 100-watt bulbs were phased out in 2013.

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