There is actually no such thing as a “white” LED light, Stephen Quick, an architect and urban designer, told HuffPost. LED lights that appear white, like the ones used in streetlights are made up of a combination of amber, red, green and blue light, said Quick, an adjunct professor of architecture at Carnegie Mellon University who was not involved in writing the AMA’s recommendations.  Quick and his colleagues took a deep dive into the research on cost-saving benefits and potential health, safety and aesthetic concerns of LED lights for a report for the city of Pittsburgh in 2011. The report was used to help Pittsburgh finalize its plan to replace its 40,000 streetlights.