In connection with the appearance and spread of COVID-19, lighting equipment manufacturers have prepared product lines and marketing programs to promote irradiators for air disinfection for domestic and industrial needs. In this regard, the CIE issued an official request for the use of ultraviolet radiation to fight the spread of COVID-19. Nevertheless, the penetration force of ultraviolet rays is small. The action of rays is limited only to the surface of the irradiated object, and the method of calculating and simulating irradiators is based on obtaining normalized values of irradiation on the surface. However, the main goal of designing bactericidal systems is to distribute UV radiation uniformly in all directions of engineering designs, regardless of their type. However, now, there is no computer graphics program allows you to get the values of normalized values at each point in space to check the effectiveness of the bactericidal system. This article presents a new method for solving the problem of modeling irradiation installations with the ability to analyze the normalized values at each point of the volume of air being treated.