Where were the first electric arc lamps installed?

The first electric arc lamps were installed in Paris, France. This innovation marked a significant advancement in lighting technology during the 19th century. The initial demonstration of electric arc lamps occurred in the early 1800s, and Paris became a hub for technological innovation, showcasing these new electric lights. The Parisian streets illuminated by arc lamps were a testament to the city's leading role in the industrial revolution and the exploration of electrical applications. This pioneering use of electric lighting paved the way for the development of further electrical technologies and the evolution of modern lighting systems that we use today.

The other locations listed, while being significant in their own right within the history of electricity and lighting, did not host the very first installations of electric arc lamps. Thus, Paris holds the distinction of being the birthplace of this groundbreaking technology.