Investigating light disadvantages of design in the city historic texture environment(case study of sheikh lotfollah mosque in Isfahan.

  In the light of environmental graphics consists of two source of natural light and artificial light .The natural light is provided  by the sun . An unpredictable thing that can not be easily controlled, and we are bound to build our environment around it .Artificial light is taken from the technology response in line with the human need to turn their world after dark. Artificial light can be created and it will control .You can create a source and object. Environmental graphics is a social phenomenon. With regard to the normalization of the image and the link with science communication and media is one of the most important methods of communication. Environmental graphics has a great visual power. In this research,using descriptive-analytical method and qualitative sampling, the light and disadvantages of its design in the Environmental graphics of shaykh lotfollah mosque have been studied. . Data collection was done using the field method(observation) and documentary(library) method. In this research, the deep-seated perception of the use of light in the graphic environment of historical texture has shown that we live in an era  where synthetic light as much as sunlight can effect the expression and creation of the  city's historical texture. Paying attention to the principles of aesthetics in the design of light from and the proper location of lighting  equipment in the historical context of Isfahan have not been considered, which can have a bad effect on the city's face. To understand the mystery of the stability of the historical context and the ultimate goal of a creative and welcoming city, it is important to ply attention to the graphic principles of  representing light and creating quality in urban space. Therfore urban management by forming groups of experts in the field of light design and attention to the principles and rules of light design it can handle this issue in the  texture.