Introduction. Despite the huge number of light-technical lighting devices with different characteristics of types and colour temperatures, there are still no specific hygienic recommendations for their use to create an optimal lighting system.
The aim of the study is to develop hygienic and lighting recommendations for creating an optimal lighting environment, taking into account the types, spectral characteristics and colour temperatures of light sources.
Materials and methods. The research was conducted in industrial conditions at the computer centres of the Pension Fund of Kyiv, equipped with fluorescent light sources, and the office of the "Azur Air" company, equipped with LED light sources. Office workers, a total of 148 people (81 and 67) with visual acuity 1.0 participated in the research, on the basis of an ophthalmological examination during work throughout the working day with an hour break in the middle.
To assess the functional state of the visual system, physiological and psycho-physiological methods of functional indicators were used: visual acuity, accommodation and its potentials, contrast sensitivity of the eye, achromatic dysparopia, visual performance, heart rate, peripheral blood pressure (systolic and diastolic), short-term memory.
The results. The experimental studies carried out in industrial conditions based on the main indicators of the functional state of the workers showed that when working under the influence of radiation generated by fluorescent lamps at Tcv - 4100K against the background of minor fluctuations in the indicators of the state of accommodation reserves and the stability of the accommodation function, the fluctuating nature of visual performance indicators is observed (p < 0.005) indicators of short-term memory decrease by 50%, and heart rate from 57.9 beats. Increases to 146 units. min. and then normalizes until the end of the work
When working under the influence of radiation generated by LED light sources at Tcv - 4500K, the indicators of the level of the functional state of workers are more stable when the level of the investigated functions fluctuates with a small amplitude.
Conclusions. When working under the influence of radiation generated by LED light sources at Tcv - 4500K, the levels of indicators of the functional state of workers have a more stable character when the level of the investigated functions fluctuates with a small amplitude.
The instability of the main investigated functions was established in the working office in the light environment equipped with fluorescent lamps, while under LED lighting the investigated functions have a stable character during the working day.
Recommendations have been developed taking into account ophthalmic hygiene and lighting requirements for creating an optimal lighting environment for office workers, the implementation of which will contribute to increasing visual performance and prevention of visual impairments.
Keywords: light environment, experimental studies, physiological methods, lighting device.