This document discusses the potential of using street lamps ("humble lampposts") as platforms for smart city technologies and initiatives. It notes that street lamps currently account for a large portion of cities' energy costs and that retrofitting them with LED bulbs and sensors could provide significant energy and cost savings while enabling additional smart city applications. The document outlines a collaborative initiative among 25 European organizations to leverage street lamps to accelerate smart city development, with a goal of outfitting 10 million street lamps across EU cities. It presents street lamps as an open platform architecture that can support various sensors, connectivity, and urban services.