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Mark Lennihan, File, Associated Press
FILE - In this Tuesday, May 6, 2014 file photo, a mostly illuminated One World Trade Center towers over the lower Manhattan skyline in New York. The neon lights of Broadway might not all shine so bright if a push to cut energy usage in the city's buildings comes to pass. Proponents want to see commercial buildings turn off their lights after midnight if the buildings are empty. Critics say it would take away some of what makes New York City sparkle.

NEW YORK — Bright lights, big city?

Not so much, if a New York City council member gets his way.

He's introduced a bill to turn the lights off in certain office buildings at night as a way to cut energy costs and help migratory birds.

But it's causing concern among others worried that dimming the lights could make the city less safe and diminish its signature sparkle.

Councilman Donovan Richards Jr. says his proposal is aimed at commercial buildings at least 20 stories high, and requires them to turn off the lights after midnight if no one is inside. It exempts landmarks such as the Empire State and Chrysler buildings.

There is no time frame for any legislation to come up for a vote.