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In a lighting system design to estimate the actual energy efficiency of lighting control systems is an important goal since an accurate evaluation could help and guide designers towards the most appropriate control system. This paper analyzes the methodology for calculating energy consumption for lighting systems and the impact of the Building Automation and Control Systems (BACS). It promotes a comprehensive ecodesign of lighting systems consisting in the adoption of the appropriate lighting components and the adaptive partitioned architecture of electrical distribution system and lighting system in general and independent local systems. It allows structurally to satisfy in each sub-area lighting and energy performances and to provide a basic efficient control system suitable for a manual or automatic regulation.