The first to be blacked out is the 100-watt bulbs, in 2013 the 75-watt bulbs, and in 2014 the 60-watt bulbs. The changes to light bulb regulations were part of the Energy Independence and Security Act of 2007 and was signed into law on December 19, 2007 by George W. Bush.
The law requires new environmental standards when it comes to light bulbs. According to the Washington Post, the law does not remove incandescent light bulbs off of store shelves - they just need to comply to new energy efficient standards. In addition to the newer higher-efficiency incandescent bulbs, compact fluorescent or light emitting diode (LED) bulbs will be the new greener replacements.
Source: Digital Journal