Karachi
Both are commonly used. However, if you want to emphasize the ownership of the lights, use " city's ". Use city lights. The cases where "city's lights" might be better are very specific, dealing with comparison to another place's lights.
There is no city that is called the city of lights during Hanukkah. Paris is called the city of lights, but that has nothing to do with Hanukkah.
In Pakistan the city of Karachi is known as the city of lights
No. the City of Lights is Paris
The duration of City Lights is 1.45 hours.
Honolulu City Lights was created in 1978.
In the City of Lights was created on 1985-11-02.
City Lights was created on 1931-01-30.
City Lights Bookstore was created in 1953.
Kansas City Lights was created in 1982.
City Lights Publishers was created in 1955.
An episode of smallville in season 7 referred to Paris as the city of lights.