The effect of light in Islamic architecture is very important. Its importance and spread is undeniable. It is an important factor in making mosque space spirituality heightened. Light is one of the affecting parameters on the value of space as the most non-material sensible element of nature which is always present in Iranian Islamic architecture. It always creates a mystical atmosphere in the place, especially religious places. In the past Iranian architecture, the application of light always comes with special elegance which improves the quality of the atmosphere of the architecture. Today, the attitude of the quantification and semantic aspects being ignored in the design of spaces often has caused to design light to provide the light needed for the reduction of physical activity. The purpose of writing this article is the introduction of quality assessment methods based on the seven principles of the light from the verse of light of the holy QURAN.

The present research methods for logical argument based on analytical descriptive and based on the field observations and library resources; The main findings of the research are as follows: a) introduction of qualitative principles of the light based on the verse of light, b) introduction of qualitative principles of the light in architectural body of religious spaces, c) introduction of objective and qualitative principles of light in religious spaces, d) introduction of the information extraction method for investigation and understanding of strength and weaknesses of the light in creation of spiritual spaces.