This document discusses the potential energy savings from improved lighting systems. It notes that commercial buildings and public buildings use 20-30% of their energy for lighting and that lighting accounts for 70% of energy costs. New lighting technology and controls can reduce lighting energy usage by 20-80% through strategies like occupancy sensors, daylight harvesting, and dimming lights based on occupancy and daylight levels. As examples, it states that Swedish schools could save 37 million euros annually with new lighting and a hospital in Norway lowered its lighting energy costs by 82% with modern, efficient lighting fixtures and controls. The document estimates Sweden's total potential lighting energy savings to be several terawatt hours per year and a corresponding reduction in CO2 emissions.