Because environmental conditions in our region, and the amounts of sunlight that is one of the highest in the world, was expected to take advantage of these rays and exploitation of buildings lighting during the day, and employ alternative energy production as a source, however, we see a lot of buildings rely on artificial lighting during the hours of the day. And the required lighting levels vary according to the architectural content and functionality of the spaces. The drawing rooms at the Faculty of Architecture of the blanks that require high amounts of lighting. The research aims to study the effect of design factors on the optical performance of the drawing rooms in the College of Architecture -Tishreen University. And determine the form of architectural vacuum, with a range of processor architectures to reach the minimum acceptable for natural lighting.