It’s a little late to say goodbye in California, where 100-watt incandescents have been effectively banned since January 1. The rest of the country will catch up to us next year, when the popular light bulb will be banned everywhere in the United States. It is not really an outright ban that is clearing the shelves of 100-watt incandescents in 2012, followed by the 75-watt bulb in 2013, and the 60- and 40-watt bulbs beginning in 2014. What’s killing the familiar bulb is an act of Congress that mandated efficiency standards that incandescents cannot meet: the Energy Independence and Security Act (EISA) of 2007. As the standard for watts per lumen (a measure of light output) become higher and higher, the familiar bulbs will begin disappearing from store shelves. It will be illegal to manufacture the less efficient bulbs in the United States or import them from abroad. A few special use incandescents will still be allowed, for example 3-way bulbs and appliance bulbs.
The most popular incandescents will gradually give way to more efficient halogen, fluorescent and compact fluorescent lights, and solid state lighting (SSL) devices like light emitting diodes (LED). The reduction in total energy use and green house gas emissions in the United States will be dramatic. According to an analysis by the American Council for an Energy Efficient Economy (ACEEE) the efficient light bulb provisions of the EISA will reduce national energy use by 60 terra-watt hours (terra equals trillion) of energy and reduce national emissions by 12 million metric tons of carbon by the year 2020.
Incandescents are already banned in Europe, but according to Ira Eisenstein, writing in the Home Energy Pros blog space, some stores there are selling 100-watt incandescents under the name “100-watt heat source.” Look for the creative American mind and the market to come up with similar workarounds in the United States. But gradually the incandescent bulb will be a thing of memory, while cleaner, more efficient, and longer lasting light sources become much less expensive.