Abstract
The technological innovation in the field of lighting and the need to reduce energy consumption connected to public lighting are leading many municipalities to undertake the renewal of public lighting systems, by replacing the existing luminaires with LED technologies. This renovation process is usually aimed at increasing energy efficiency and reducing maintenance costs, whist improving the lighting performance. To achieve these results, the new luminaires are often characterised by a luminous flux distribution much more downward oriented, which may remarkably influence and alter the perception of the night image of the sites. In this study the implications of the renovation of public lighting systems in terms of lighting and energy performance as well as the effects relating to the alteration of the night image, in historical contexts characterized by significant landscape value, are analysed. Results, along with demonstrating the positive effect that more sustainable and energy efficient lighting systems may have on the lighting performance and energy consumptions of public lighting systems, evidences the impact they may have on the alteration of the nocturnal image.
Highlights
The results demonstrated that the introduction of high efficient light sources such as LED allows one to significantly improve the lighting performance, as well as contain energy consumptions and expenditure
The quantities calculated for the driveways (M-S1, M-S2) were: the average luminance (Lav ), the overall uniformity (Uo ), the Threshold Increment (TI) and the Edge Illuminance
The introduction of innovative and flexible systems could be a first step toward the smart cities approach
Summary
The application of new technologies is one of the solutions adopted to obtain sustainable economic development, decrease energy consumption and improve the quality of life [3]. Within this frame in public policies, among the different contexts of intervention (buildings, mobility, etc.), the renewal of lighting systems has assumed a fundamental role. Light is an element able to define the nocturnal image of urban spaces and to enhance monuments and architectures in the cities It represents a significant item of recurrent expenditure in the budget of municipal administrations [6], for energy and maintenance costs, and could have a significant impact in terms of energy consumption and light pollution [7]
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