Study of the Lighting Conditions Created by the Second Generation Led Light Sources

Author Name(s): Olga E. Zheleznikova, Ivan V. Blentsov, Olga S. Voynova, Sergey N. Ageev, Mohammed Salim Dzhuma
Author Email: sarstf@mail.ru

Abstract

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.

Introduction

The high growth rate of the LED products market contributes to their widespread use due to significant energy savings and lower operating costs. However, a primary feature of the radiation created by modern white LEDs is significant radiation flux intensity in the blue part of the spectrum. This fact causes a wide range of opinions in the scientific community on the medical and biological aspects of the LED radiation effects on the organs of vision, psychophysiological state and general physical health of a person [1-3]. In fact, the results of foreign work in this area are used in practice of LED lighting application in Russia. At present, the second generation white LEDs have appeared on the market, the development of them is aimed at reducing possible photobiological hazard to vision, since their spectrum is close to the solar one [4-5]. It can be assumed that second-generation LEDs will not be as dangerous for the organ of vision as some experts believe. However, this is possible to prove only on the basis of the conducted experimental studies. In Russian and foreign literature sources, there are data only concerning a few research results on the effect of first-generation LED lighting on certain vision functions and visual performance, and those results are extremely contradictory and ambiguous. This gives grounds to consider the studies performed as relevant. The purpose of this work is a comprehensive assessment of the efficiency of illumination created by second generation LEDs (ILED), taking into account the state of the organ of human vision, and integrated indicators of visual performance.

Conclusion

An analysis of the results showed that the second-generation LED illumination does not cause a negative effect on organs of vision and indicators of visual performance (age group 20-25 years).Studies carried out under different lighting conditions (LED and FL) revealed both the close connection of the visual functions with the compensatory-adaptive reaction of the organism, and the stability of adaptive systems and systems responsible for regulating the sensitivity of the organ of vision and the organism as a whole. The results of the studies can be used to develop practical recommendations for implementation of second-generation light emitting diodes.

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