In this paper is presented the study of a student of the Design Master Postgraduate Program of the Universidad Autónoma de Aguascalientes, with it the student is expected to get his title. The study is about the useris perception of the architectural space and how it is influenced by it illumination conditions. The work is being carried by the digital modelling and the simulation of the illuminating conditions, using photorealistic virtual reality digital environments. It makes possible to manipulate the architectural space compound elements in a rapid and anticipated way, after the data analysis of the results the architectural space and their illuminating conditions are going to be modeled and simulated using the full scale (1:1) Architectonic Space Modelation and Simulation Laboratory of the University.