1. TECHNICAL PERFORMANCE ANALYSIS OF A 40 KW PHOTOVOLTAIC INSTALLATION. Authors: FLORINA PIROI, ION PIROI, ELISABETA SPUNEI.2. STUDY ON THE IMPORTANCE OF UPGRADING PUBLIC LIGHTING SYSTEMS. Authors: MIHAI ROTARU, FLORINA PIROI, ION PIROI, ARPAD CSEPEI, ELISABETA SPUNEI.3. PERFORMANCE ANALYSIS OF FLUORESCENT AND LED LIGHTING SOURCES. Authors: ELISABETA SPUNEI, SORIN FLORIN DUMITRU, CRISTIAN PAUL CHIONCEL, FLORINA PIROI.