This report, one of a series of end-use energy technology assessment reports, investigates the current and potential use of lighting technologies for commercial buildings. The aim of these investigations is to synthesize current information from both published and unpublished sources so that utilities, state regulatory commissions, and others can better identify, evaluate, and select demand-side resources to meet their needs. The material covered in these reports is not limited to success stories'' but also includes failures, barriers, uncertainties, and information gaps. In addition, we attempt to identify and, if possible, reconcile variations or discrepancies among data sources. The technology assessment reports are designed to be easily updated in the future as the technologies develop and better data become available. 5 figs., 22 tabs.