High efficiency lighting systems with advanced controls

The adoption of LED modules coupled with advanced control systems allows to obtain a high level of performance both for occupant's satisfaction and for energy performance. The paper describes the lighting design process and highlights that the impact of controls on the energy performance can be very high. A complete case study of a lighting system renovation implemented in a library room is shown. The library was divided in different zones. In each zone the optimal control was adopted. Energy results demonstrated improvements in energy savings and performance via the proposed means. The energy performance measured before the renovation and after the renovation is 72 kWh/m 2 per year and 8.5 kWh/m 2 per year, respectively, with a saving of more than 70%. The paper introduces a double level on/off switch, one based on the soft BUS control and the other based on deep switch of the power circuit that allows savings the stand-by power during the long off-time and increases the reliability. The paper highlights the importance of the post-installation phases, which concern parameter programming and optimization. Only thanks to a careful measurement and monitoring system is it possible to optimize the operation of the automatic control systems and to implement the Plan-Do-Check-Act (PDCA) approach.