The effect of the outside design elements in daylight levels impact on windows

The architects recognize the role of environmental elements (specially the daylight) in reach to successful design achieving better user's performance. The daylight goes to the essence of architectural work by helping to inspire the spaces with their shapes, colors, touches and surfaces. The aim of this research is to determine the fundamental step in daylight design, by measuring the daylight impact on windows. This light is the main source in lighting interior space after it's through the glass panel of window and diffuse in space. So, it's possible to increase interior light level by controlling the external daylight impact on window. To reach the research's aim, dividing made on the theoretical frame by two steps: First: Admeasure the amount of sky light impact on window. Second: Admeasure the effects of outside designing elements added to windows (such as: shadow devices, thickness of external wall and all characteristic surfaces near window), and these elements will perform in two ways.