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This research aims to study the effect of daylight on energy consumption in educational spaces of the Faculty of Engineering, Sohag University, by conducting a simulation using the design builder v7 program. The building was modeled based on the building drawing and the actual reality of implementation through frequent field visits, the data entered is energy consumption of electrical appliances and lighting units for space, occupancy schedules that determine the number of study hours, number of users including students, faculty members, and employees, activities that are practiced in the space, The recommended illumination level for each space. The different specifications of building materials and finishes were also entered (Visible absorptance, Surface light reflectance value, Roughness, Specularity reflection) and the specifications of windows, the dimming control system and The Perez All-weather sky method which requires the values of Direct Normal Irradiance (DNI), Diffuse Horizontal Irradiance (DIF) of the New Sohag area in Sohag Governorate. By simulation, it was found that the consumption of lighting energy in educational spaces decreases by 39.85% in the case of open windows than closed windows, and in the case of open windows in educational spaces, lighting energy consumes 29.32% of the building’s energy consumption, and in the case of closed windows in educational spaces, lighting energy consumes 40.82% of building energy consumption. [ABSTRACT FROM AUTHOR]