"Beginning January 1, 2011 light bulb manufacturers will be required to meet new efficiency standards in California to save consumers money and energy. The standard, passed by Congress and signed by President George W. Bush, becomes effective nationwide January 1, 2012. California has enacted the federal standards one year earlier to avoid the sale of 10.5 million inefficient 100-watt bulbs in 2011 which would cost consumers $35.6 million in unnecessarily higher electricity bills (Source: PG&E Case Study). By reducing energy consumption the standard will reduce air pollution from the burning of fossil fuels in power plants while producing the same quality of light as traditional incandescent bulbs." -http://www.energy.ca.gov/
For more information follow the link below.