The US Department of Energy (DOE) released a report for the United States Detroit City, the existing high pressure sodium lights for LED lights for the effect of assessment. The title of the report is set to 'return to the Detroit streetlight system', which provides information on objective street lighting installation, including the installation process and decision making and the latest results after installation. In 2013, Detroit announced bankruptcy, the city's 88,000 high-pressure sodium lamp is estimated that about
half of the unbearable use. Due to the annual loss, in addition to the need to repair and replace most of the street lights, there are more related power infrastructure needs to be replaced. The above 88,000 street lights, including roads and residential areas, in recent years, the density of living are significantly reduced, so if all the facelift is also quite waste, and finally the relevant units decided to change only 65,000 LED lights. Reported: Compared with the high pressure sodium lamp, the new LED street lamp to reduce energy consumption by 60% a year to save about 4.6 million kWh (kWh), equivalent to save about 2.9 million US dollars. The energy savings and maintenance costs saved by facelift are just enough to offset the cumulative cost of LED lights, as long as about 2.5 years, save the energy consumption will be able to return to this. The new LED streetlight system should also be able to be more durable and make the surrounding environment safer and reduce the theft rate. The lighting effect of the new lighting system is superior to that of the traditional lighting system. However, due to the removal of many lamp posts, the lighting quality of some residential areas is not so ideal. For more information, see the report on the DOE Solid State Lighting website. (CompiLED Recessed Spotlight: China LED network / emmachang) more LED related information, please click on the Chinese LED network or focus on WeChat public account (cnLED Recessed Spotlightw2013).