1. World Governments adopting Bright Idea. www.worldwatch.org/node/4941.
2. How Much Electricity Is Used for Lighting in the United States? www.eia.gov/tools/faqs/faq.cfm?id=99&t=3.
3. Today in Energy,2012
4. How Is Electricity Used in U.S. Homes? www.eia.gov/tools/faqs/faq.cfm?id=96&t=3.
5. Incandescent Light Bulb. en.wikipedia.org/wiki/Incandescent_light_bulb.