This UNI/PdR supports the use of the program LENICALC for the calculation of LENI according to method 2 (complete calculation) of the UNI EN 15193-1:2017 standard. This UNI/PdR and the software is to be applied to non-residential buildings, as specified by UNI EN 15193-1:2017. Neither the standard (UNI EN 15193-1:2017), nor this UNI/PdR and the software are concerned with lighting requirements, which are in scope of UNI EN 12464-1, UNI EN 12193 and UNI EN 1838.Furthermore, the UNI/PdR and the software do not cover lighting requirements, the design of lighting systems, the planning of lighting installations, the characteristics of lighting equipment (lamps, control gear and luminaires) and systems used for display lighting, desk lighting or luminaires built into furniture.