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Lighting consumes one fourth of all energy consumed worldwide, and case studies have shown that commonly 50 to 90 percents of building lighting is unnecessary for the purposes required. Energy is wasted when light does not fall on its intended target, as when lighting fixtures allow light to go up instead of (as it is generally preferred) downward. Leakage also occurs when more light is generated than needed. Many governments are looking for ways to reduce energy use after signing the Kyoto Protocol, and individuals, organizations and local authorities are increasingly improving lighting efficiency in order to reduce energy consumption. The main scope of this paper is to establish some criteria in designing a sensing and signal conditioning system for energy saving in public lighting.