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The rational use of daylight can significantly reduce the cost of electricity for artificial lighting. This research aims at investigating the parameters of translucent structures of building envelope, and the value of daylight factor, for which maximum efficiency of daylight usage is achieved in office rooms. The study analyzes the dependence duration of daylight autonomy in office rooms, on the value of daylight factor for four European cities. The specific daylight autonomy (h/(year•m 2)) of office rooms were found. It was proved, that regardless the size of the rooms, the maximum specific daylight autonomy in Ternopil city (at illumination of 300 lx, which is prescribed by regulations), with lateral daylight, occurs when the daylight factor is in the range of 1.7% to 1.9%. Maxima-at 1.8%. At illumination of 500 lx, the maximum specific daylight autonomy will occur at a daylight factor range of 2.6% to 3.0%. Maxima-at 2.8%.

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The article deals with the economy of electric energy, which is spent on room lighting, because of increasing interests of natural light. As a result of the research, there has been obtained an analytical expression for determination of the absolute and relative glazed area of window embrasure of any configuration. This gives an opportunity (taking into account the costs of manufacturing) to choose a rectangular as the main configuration. It has been proved that only on the dependences of glazed area from window embrasure it is possible to come arrive to a decision with an acceptable range of metal-plastic window sizes in terms of providing high natural illumination of the premises.

The aim of the research is to determine the economic and energy efficiency usage of the artificial lighting control systems, with the help of astronomical relays and motion sensors, by various types of light sources for the stairwells (stair landings and staircases) of multistory residential buildings. The analysis of the residents' monthly movement intensity of the 9-story residential buildings through the buildings entrance, doorways, and apartment doors was carried out. The economic and energy efficiency of use the artificial lighting control systems with an astronomical relays and motion sensors with different types of light sources was determined. Regardless of the light sources` type, the astronomical relay's use leads to reduction in the electricity consumption of artificial lighting in 43.31%-50.52%. Moreover, the motion sensors' use on stairwells leads to a significant reduction in electrical energy consumption: in a case of halogen lamps-by 97.73%, compact fluorescent lamps-by 95.27%, light-emitting diodes lamps-by 93.98%. For the first time, the data of 9story residential buildings inhabitants' traffic intensity through the first-floor doorway for the Ternopil city, Ukraine has been carried out. It has been proved the economic feasibility and energy efficiency of using combined lighting with an artificial lighting control system for stairwells of multistory residential buildings.