This report, written jointly by RW Ventures and Innovation Network for Communities, explores opportunities for Chicago-area firms arising from the increasing market demand for energy- and resource-efficient products and services. The first part of the report describes the project’s cluster approach, outlining the theory behind cluster-driven economic growth and identifying the particular criteria used to select promising clusters for the project. Using these criteria, the report narrows from many green sectors of opportunity to the one–energy efficient lighting–ultimately chosen to illustrate green cluster development. The second part of the report digs deeper into the energy efficient (EE) lighting sector, providing an overview of the industry and its current trends and dynamics. The report ends with recommendations for development of Chicago’s EE Lighting sector as well as strategies for regional green economic development more broadly. Also available for download are an executive summary of the report produced by Metropolis Strategies and a copy of Bob Weissbourd’s presentation based on the report.