In this thesis are investigated lighting control systems, peculiarities of lighting systems, classification, requests, counting methods. There are given a lot of information about daylight and illumination, in analytical part. In reference with illumination values, given in the hygiene norms, there are calculated the number of illuminators in the room. Lighting control systems efficiency is investigated by comparison manual lighning control with automatic. In this thesis are investigated, how many power we lose, when selecting manual control system instead of automatic control system with digital devices. According to results of experiment, there are made characteristic of power deppencies on illumination. Conclusions are formulated at the end of a transaction.