The LEDs distribute light more efficiently, require less energy and last 15 years compared to 1.4 years for fluorescent lighting. More than 1,700 LED fixtures replace some 4,000 fluorescent ones in the tunnel. Port Authority officials say they'll save $340,000 each year in energy and maintenance costs. They will reduce carbon dioxide emissions by about 3 million pounds.

The George Washington Bridge's "necklace'' of 156 mercury vapor fixtures are to be replaced with LEDs in January.