The purpose of this study is to balance competing goals for energy conservation and environmental amenity in an office-based workplace, which we called a 'Smart Workplace'. This purpose was achieved by developing an equipment control system that responds to a worker's location and workplace environmental information utilizing information communication technology. In particular, the lighting control system illuminated only the workspace occupied by a worker and used the worker's illuminance preferences. This paper presents measures of energy conservation and satisfaction ratings provided by the workers using the lighting control system.