Background. Development of new LED lighting systems, based on different types of LEDs (for example: WW, RGB, RGBW, RGBA, to name a few) and implement a dynamic change of color parameters of light and its intensity in given scenarios, requires the development of new methods of color mixing. These methods need to be tested and improved in the process of their development, as well as take into account the real aspects of application and different power supply modes of LEDs. It is convenient to check the developed methods with the help of specialized programs that allow obtaining and analyzing the total spectral characteristic of mixed light on the basis of known spectral characteristics of individual LEDs in arbitrarily given proportions. However, it is clear that such theoretical color mixing does not take into account the dependences of the photometric parameters of LEDs on the control mode and temperature conditions of their operation, which is observed in practice. These factors indicate the need to develop a group control system for LEDs to implement a practical test of color mixing methods using associated spectrophotometric equipment. Objective. The purpose of the paper is development of a group control system for LEDs for the study of color mixing methods. Methods. Set and control of accuracy of reproduction of current values through the LEDs in a constant and pulse power supply modes. Results. An eight-channel system of group control of LEDs is demonstrated, which operation modes can be adjusted both manually and with the help of a computer, which allows fully automating the study of mixed light parameters using additional spectroradiometric or photometric equipment. Studies of the system parameters have shown that the use of an additional auto-tuning function has significantly increased the accuracy of setting the current values of the supply currents of LEDs and stability of the output currents from the supply voltage of the system Conclusions. The developed system of group control of LEDs can be used for experimental research of theoretical calculations of color mixing models. The results of the research will allow us to analyze the developed methods of color mixing, to improve them and to carry out practical adaptation to artificial LED lighting systems, which are designed to illuminate workplaces and recreation, taking into account the circadian impact on psychophysical and emotional condition, agro-industrial lighting for animals and phytolighting plants, medical treatment or disinfectant lighting, lighting of cultural and artistic objects, outdoor street and industrial lighting. Conclusions. The developed system of group control of LEDs can be used for experimental researches of theoretical calculations of models of mixing of colors. The results of the research will allow to analyze the developed methods of color mixing, to improve them and to carry out practical adaptation to artificial LED lighting systems, which are designed to illuminate workplaces and recreation, taking into account the circadian impact on psychophysical and emotional condition, agro-industrial lighting for animals and phytolighting plants, medical medical or disinfectant lighting, lighting of cultural and artistic objects, outdoor street and industrial lighting.
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