Replacing the optical compartment upgrades the optical technology from conventional sources to LED sources, quadrupling the lighting efficiency and extending the lifespan of the source. This has an immediate impact on energy saving and maintenance costs, thereby offering longer duration and consequently better sustainability. The most complete retrofit kit ensures a full-scale technological, visual and aesthetic upgrade. Integrating smart electronics on-board the pole helps manage the luminous flux in relation to effective needs, thereby ensuring further energy savings. Lastly, activating smart services transforms the lighting system into a communication network.