The paper presents the modern street lighting control systems with microcontroller AC regulator for lighting applications [1]. The system makes it possible to accurately control and monitor the lighting. The control cabinets are online all the time; the solution guarantees energy savings, due to the dimming option, traffic safety and lighting comfort. The basic idea of the system is for a group of street lights, typically for a stretch of road, to be controlled by a lighting office.

Harmonic analysis is a mathematical method that performs the determination (approximation) of continuous functions by the sum of ideal sinusoids. By selecting these sinusoids in a judicious way, in defining the methods of smart measurement of a part, it is possible to separate the geometrical elements of a part into geometric elements of the shape (circularity, eccentricity, etc.) of the geometric elements corresponding to the state surfaces. This article, using the research carried out under the doctoral thesis "COMPLEX STUDIES, RESEARCH AND EXPERIMENTATION OF PRECISION MECHANICAL GEARING TRANSMISSIONS USING HIGH PRECISION HARMONICS METHODS ", aims to perform an original work and thus to present and analyze the main methods of processing the data gathered in the process measurement of the parts made and used in mechatronic equipment by resorting to harmonic analysis.