21st Century. Street fixtures have evolved from being mere tools for a specific purpose to becoming instruments that serve both the city and the planet. In other words, streetlights have gone from being fixed points or poles within the urban public lighting network to becoming key components in the structure of a smart city that enhances energy efficiency. Behind this key innovation for energy savings in cities lies the advancement of new technologies and Artificial Intelligence (AI). Thanks to the integration of state-of-the-art IoT sensors, advanced connectivity, and remote management algorithms, these structures optimize public resources and redefine urban sustainability. As a result, a streetlight can also serve as a Wi-Fi hotspot, a mini weather station for collecting real-time data, or a sensor for traffic management. From oil streetlights to AI streetlights How did this transformation come about? Paris, 1667. The City of Light introduced the first urban lighting system in the 17th century with 2,700 oil streetlamps, installed by order of King Louis XIV to curb nighttime theft and provide safety for pedestrians. This set the precedent for public lighting in European cities, which began using gas in the 19th century before evolving into the streetlights we know today in our neighborhoods and on our avenues. Traditionally, streetlights remained at 100% capacity throughout the night in the most densely populated urban areas, consuming excess electricity and energy, even at dawn. The paradigm shift involves a smart streetlight that reverses this trend through adaptive lighting; that is, it is capable of adjusting its brightness using real-time motion sensors. By replacing old sodium-vapor lamps with LED technology and remote management, the system reduces its brightness to a minimum when the street is empty and activates fully only when it detects pedestrians or vehicles. According to industry reports published on the European