APPLYING MULTI-CRITERIA DECISION ANALYSIS FOR SELECTING STREET LIGHTING LUMINAIRES Evangelos-Nikolaos D. Madias 1 , Lambros T. Doulos 1 , Panagiotis A. Kontaxis 12 , Frangiskos V. Topalis 1 . National Technical University of Athens, Lighting lab 2 Technological Educational Institute of Athens Summary Aim of this paper is to present a multicriteria decision methodology for choosing the appropriate luminaire for lighting provincial streets, which belong to various classes of EN 13201. To begin with, five different types of low wattage street luminaires (70-85W) are presented, each one representing a different lighting technology from the ones mentioned above. Each type of luminaire is evaluated using a consistent set of criteria, namely price, energy efficiency (lm/W), light output ratio, lamps’ lifespan, illuminance at the street level and illuminance uniformity. A certain weight is attributed to each one of the criteria. Consequently, the ELECTRE I multicriteria method is applied. The concordance and discordance indices are computed associating each ordered pair of luminaires. Moreover, a concordance and discordance threshold is defined. As a result, the outranking relations between the luminaires are found, the outranking graph is constructed and the kernel is deducted. Finally, the results of the method enable the decision maker to make the optimal selection of the most suitable street luminaire for each type of street. 1. Introduction Nowadays, a wide variety of lighting technologies exist and it’s not always clear what type of luminaire is suitable for each application. Especially in road lighting, the most usual types of luminaires are the ones using mercury vapour lamps, high pressure sodium lamps and metal halide lamps. The share of light emitting diodes and –secondary- of induction lamps increases rapidly. Each type of luminaire has different attributes concerning price, energy efficiency and lighting performance. Furthermore, some types of luminaires can be more suitable than others for illuminating a certain type of road or street. Therefore, the decision to choose the optimal road luminaire for each case is a rather complicated one. The decision maker needs to take into account all the factors mentioned above. 2. Overview of the decision methodology In order for the decision maker to make the appropriate selection, a multicriteria methodology is needed. In this paper the ELECTRE I method is implemented. It is a family of multi-criteria decision analysis methods that originated in Europe in the mid-1960s. The