The U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) began the 10-city, 20-day Energy Star Change a Light Bus Tour on October 3, 2007 (dubbed Change a Light Day), to promote Energy Star's message that using energy-efficient lighting products is an easy way for homeowners to fight climate change. Energy Star-qualified light bulbs and fixtures use about 75 percent less energy than standard incandescent lighting, according to the DOE.

Part of Energy Star's Change a Light, Change the World campaign, the Change a Light Bus Tour will travel around the U.S., making 16 stops along the way to set up an outdoor education center with interactive displays to teach visitors about the importance of the lighting choices they make, how to use and dispose of compact fluorescent bulbs, and about the connection between personal energy use and climate. Consumers and organizations are encouraged to visit Energy Star's website to take the online Energy Star Change a Light Pledge.