The owners of the Empire State Building are replacing the building's 400 existing standard lamps — technology that was introduced to coincide with the 1976 bicentennial — with 1,200 newly designed fixtures using the latest LED technology.
Use the link below for more:
http://cityroom.blogs.nytimes.com/2012/05/07/with-new-lights-a-more-vibrant-look-for-the-empire-state-building/