The main question of Smart Light Concept's practical research is: how can local governments reduce their carbon ootprint in a financially responsible manner by investing in energy-saving smart public lighting. Behind this question lie several research questions: What is the right technology for smart street lighting? What will it cost and can the municipality recoup the investment? What does smart lighting mean for social and road safety? What do citizens and road users think of it? These questions are addressed in the various research themes.