ENERGY EFFICIENCY INCREASE IN PUBLIC LIGHTING SYSTEMS

Worldwide most public lighting fixtures use outdated technologies with sodium, metal halide, mercury lamps, and there is a high potential to save energy by switching to LED. Projects to increase energy efficiency in public lighting involve optimization measures in order to choose the optimal solution in compliance with the performance criteria specified in the standards for public lighting. This paper presents methods of optimization in the process of modernization of public lighting system. It is analyzed both the optimal variant of placing the lighting fixtures in the variant of partial modernization but also in the variant with total modernization. Lighting calculations and optimizations were performed using several types of lighting fixtures with different optics and light flux. The indicator of the annual energy consumption for the public lighting installation. is calculated in the two analyzed variants. It was established that the optimal final option is the one that cumulatively meets the following requirements: the chosen luminaire has the lowest installed power among those proposed, the distance between the poles is the largest, the poles have the lowest height of the proposed variants, the consoles have the lowest length, for minimal investment costs.