Light & Engineering Vol. 23, No. 4, pp. 33-40, 2015 Svetotekhnika No. 5, 2015, pp. 42-47 ADAPTIVE SYSTEMS IN ROAD LIGHTING INSTALLATIONS* Giuseppe Rossi1, Paola Iacomussi1, Andrea Mancinelli2, and Paolo Di Lecce2 1 INRIM, Torino, ITALY, 2 REVERBERI Enetec, Castelnuovo ne’ Monti (RE), ITALY g.rossi@inrim.it ABSTRACT The new revised European standards for road lighting will be published in July 2015 highlighting the importance of energy performance aspects in road installations. <...> The adaptive lighting approach can increase energy saving and reduce the environmental impact if compared to traditional solutions with the same type of luminaires and installation layout. 1 For these reasons, the next revision of the Italian standard on the selection of lighting classes will consider adaptive installation suggesting peculiar requirements and control strategies as supplement to the European standard requirements. <...> The paper describes the development of a luminance and traffi c detector for adaptive system and the results of measurements carried out in more than one year on two experimental road lighting installations representative of an high volume traffi c road (starting lighting class M2) and of a medium volume traffi c road (starting lighting class M3). <...> INTRODUCTION The adaptive lighting concept is defi ned in (CEN, 2014) as “temporal controlled changes in luminance or illuminance in relation to traffic volume (e.g. veh/5 min), time, weather or other parameters”. * On basis of report published in Proceedings of 28th CIE Session, 2015, Manchester 33 For example, adaptive road lighting installations are able to maintain constant at the requested value the road surface luminance or illuminance despite the installation ageing, considering: • A wide variation range of key parameters (luminous intensity depreciation of luminaire, variability of the road surface refl ection properties, instability of the column voltage, etc.); • The change of the installation lighting class according to design constraints (for example traffi c volume); • Actual conditions instead of hypothetical ones linked for example to the weather conditions or emergency situations. • Conceptually we can classify an adaptive system, in ascending order of performances, as: • Open loop system: the lighting class change is controlled <...>