The system of guaranteeing the quality of higher professional education is a timely, urgent and acute problem for any technical university. The competitiveness of the university in the educational services market, the priorities of the state policy in the sphere of education, the formation of a mass higher school, the process of the formation of the European educational space, all this contributes to the need to promote, to develop and to introduce new methods and means in the professional training of students. The method of the “Tapping test” is designed to determine the properties of the nervous system according to the psychomotor parameters of students. The purpose of the study was the improvement and adaptation of the “Tapping test” method, the justification of the use in technical training of students of technical universities. The object of the study was the methodology of testing in the professional training of students of technical universities. The subject of the study is the possibility of applying the “Tapping test” method as a means of diagnosing the influence of auditor lighting on the quality of in-university training. The objective of the study was to evaluate the influence of LED lighting on visual performance in comparison with luminescent and natural. Hypotheses: 1) the “Tapping-test” method is applicable for assessing the degree of influence of the light-colored environment on the quality of vocational training of students of technical universities; 2) spectral features of the radiation of light sources affect the psychomotor activity of students of technical universities. This article presents the results of research on the effect of LED luminaires at different color temperatures of the luminous flux on the efficiency and emotional state of a person on which the effectiveness of the learning process depends. As a result of the work done at the Kazan State Power Engineering University, the comparative analysis of data using statistical methods did not reveal a reliable shift in the test results, which proved the inconsistency of the classical testing technique, but it was proved that better lighting contributes to the growth of students' performance. In order to reduce the probability of errors during testing, we created a prototype of a mobile application that is as close as possible to the described express test, but lacks many disadvantages of the outdated methodology.