During the energy audit of the Faculty of electrical engineering in Ljubljana it was established that the lighting of the areas at the faculty was in many cases outdated, inadequate and energy consuming. In this thesis we focus on the energy analysis of the lighting renovation of lecture hall P7 and office AZ101. In planning and selecting the lighting equipment we took into consideration all the technical and energy guidelines for an efficient lighting of educational buildings.
The thesis starts with an introduction to the physical basics of light, where the basic theories of light radiation and the identification of the colours of light are presented. In the chapter “Svetloba in človek” we describe light and how it affects our visual capabilities and the biological impact of artificial light on the human body. The thesis also sets out the criteria for quality lighting and all the relevant standards that need to be complied with in designing indoor lighting. The chapter about the energy efficiency of lighting describes the characteristics and the efficacy of light sources and their ballasts.
The objective of the thesis is to find an energy and technical alternative to the existing lighting for the lecture hall and office. In the calculations we compared the fluorescent light sources T8 and T5 and a LED source. The lighting was designed in accordance with the European standard SIST EN 12464-1:2012, relating to the lighting of indoor work places. For an efficient use of electric energy for lighting we followed the technical guidelines of TSG-1-004:2010. The lighting-technical calculations of the concerned areas were performed using the DIALux software. The lighting layouts were plotted using AUTOcad.
Based on our calculations we concluded that the most adequate replacement of the existing lighting of office AZ101 and lecture hall P7 were lights with fluorescent lamps T5 and with electronic ballast. LED lights turned out to be the most energy efficient; however, their use would be inefficient in terms of cost due to the current high prices. Consequently, the period of recovery of the investment would be significantly long, probably longer than the warranty period/product life. LED lights unquestionably represent the future in all lighting areas, since their efficacy is increasing every year, while their price is dropping due to large-scale production.