Rethinking Public Lighting: From Energy Efficiency to Territorial Night Governance

Over the past fifteen years or so, street lighting has undergone a profound transformation, driven by the energy transition, advances in LED (Light-Emitting Diode) technology, and the need for local governments to sustainably control their expenditures. Long viewed as a technical infrastructure primarily aimed at ensuring visibility and safety for nighttime travel, it is now at the heart of broader issues, combining energy efficiency, quality of life, regional attractiveness, and the preservation of the nighttime environment.

This evolution is taking place against a backdrop of multiple constraints. On the one hand, rising energy costs and national energy-reduction targets are forcing local governments to undertake ambitious modernization programs. On the other hand, societal expectations are changing: concerns related to biodiversity, sleep, the night sky, and perceptions of safety are leading to a reevaluation of lighting practices beyond their purely technical aspects.

In this context, street lighting is increasingly seen as a complex issue in local decision-making, where objectives—sometimes complementary, sometimes contradictory—intersect. Reducing energy consumption without compromising perceived safety, preserving the nighttime environment while maintaining the attractiveness of urban centers, and optimizing costs while ensuring quality of service: these trade-offs reflect a gradual shift in the role of lighting, which is becoming a key driver of urban policies.

Thus, the transition to efficient public lighting is no longer limited to a technological change. It requires an integrated approach, combining technical assessment, territorial strategy, consultation with users, and appropriate management tools. This article is written with this perspective in mind, aiming to examine the regulatory frameworks, technological levers, and methodological approaches that make it possible to reconcile energy efficiency, sustainability, and social acceptability.

The objective of this article is therefore to provide decision-makers and engineers with a framework for understanding how lighting choices are now part of a comprehensive regional approach, at the intersection of energy, environmental, and social issues.