When most people think Michigan they definitely don’t think ‘wave of the future’. But, starting now (actually Nov. 2007) and rolled out over the next 2 years, Ann Arbor will replace all street lights with LED lights. The city set a precedent by testing 25 LED lights over 3 years proving a 50% cut in energy use, and in turn calculating a complete return on investment ($630k) in 3.8 years for all city street lights replaced. Best of all it will reduce CO2 emissions by 2,425 tons annually, which is equivalent to 400 vehicles off the road.
Picture above is the best example I could find.