Negawatt

Jordan Eccles helped design this sweet iPhone app for Dan Ariely. Here is his description:

The app is designed to help people make choices about changing lightbulbs intheir homes from incandescents to CFLs (or LEDs), since despite their benefits they occupy maybe 1 in 10 eligible sockets in residences. The idea was to make it easy for people to see the cost of a home with incandescent bulbs and then to see the benefits of switching their bulbs to more energy efficient ones.

The app is loaded with a default "average" home, with the lighting fixtures in the home organized by room. A user can modify the home by adding, removing, and renamingrooms and lights. As the lighting fixtures are changed to CFL or LED
bulbs, a summary screen starts to add up the benefits, and changes from red to green as you utilize all the savings. There is also an advice tab that is organized based on the characteristics of the home,which will (for example) show you the 10 most expensive light fixtures.

Download the Free iPhone app here.