It is experimentally found that LEDs illumination does not cause a negative influence on visual organs and human body as a whole. It is shown that changes of visual organ functional indices for visual operations are within the correspondent boundaries of physiological fluctuations and have a reversible nature. Integral indices of LEDs illumination efficiency from visual working capacity and visual fatigue degree are estimated. A practical importance of the obtained results is shown.

The article describes experimental studies on the effectiveness of lighting installations (LI) with light-emitting diodes (LEDs). It is established that LED-based lighting does not cause a negative impact on the organ of vision and the human body as a whole. The changes in the functional parameters of the organ of sight, which occur during the visual performance has the corresponding limits of physiological fluctuations and are reversible. The integral indicators of the efficiency of LED-based lighting were estimated. The practical significance of the results was shown.

The important problem of the poultry farming is the prevention of infectious diseases causing poultry deaths and unplanned financial losses. The article authors represent an overview of the air disinfection methods and the selection criteria for the disinfection methods being the most effective among other methods applicable for poultry facilities. There were determined the main factors influencing the germicidal efficiency of the ultraviolet (UV) irradiance sources. Studies were considered, where influence on the germicidal efficiency was discussed in terms of the UV irradiation exposure time in poultry facilities with floor conditions. The theoretical parameters substantiation is given for the device combining the two main disinfection components; it is done by development of both the mathematical model for the average irradiance rate calculation and the calculation method of the highspeed air flow parameters. Also, the method has been developed for determination of the needed number of the combined germicidal aerosol units in poultry keeping premises. The authors present the results of the experiments conducted for determination of the germicidal efficiency of the disinfection fulfilled against such microorganisms as Coli bacteria, Kochii bacilli, etc. with use of the developed combined recirculator. The experimental comparison with a prototype was carried out for the decontamination efficiency achieved with aid of the newly developed combined germicidal aerosol recirculator used in the following mode: the exposure time made 1 hour of work, then 2 hours of break on condition of the process cycling throughout the entire daylight hours. Here presented is the recommended layout of a number of the combined germicidal aerosol units in box-type rooms with poultry keeping on floor in a case of the ideal air flow direction. The increase by 20 % was found in the disinfection efficiency as well as the growth by 7 % in the additional live weight gain of the poultry.

The article presents the results of photobiological studies aimed at determining the preferred requirements for the spectrum of combined spectrum LED phytoradiators for the light culture of cucumber plants, variety Liliput F1. The studies were conducted in the artificial climate laboratory of FSBEI HE N.P. Ogarev Moscow State University, using an experimental research hydroponic plant. The results are presented and the effect of the spectral compositions of phytoradiators based on LEDs on the growth and development of Liliput F1 cucumber plants is estimated. The studies (the first vegetation) made it possible to preliminarily identify the most favorable radiation spectrum, which provides the best biometric characteristics and productivity of plants of Liliput F1 cucumbers.

The paper is devoted to the study of the lighting conditions created by the second-generation LED light sources. It has been established experimentally that illumination created by second-generation LEDs does not cause negative effects on human organs of vision and body as a whole. It is shown that changes in the functional parameters of the organs of vision occurring during the performance of visual work fall within the respective limits of physiological fluctuations and are reversible. Integral lighting efficiency indicators of the second generation LEDs by visual performance and the degree of visual fatigue are estimated. The practical significance of the results obtained is shown.