1. Introduction In this research, THE functions of light in SEPEHRI’ s POEM were studied and analyzed based on THE semiotics-semantics view. THE main purpose of THE present research is to study THE discursive state and transformation of light in SOHRAB SEPEHRI's poetry, based on his four POEM books entitled "East of Sorrow", "Traveler", "THE Water’ s Footfall" and "Green Volume". Our main questions are what status THE light gains, how it comes to operate and spread, how light can create meaning, and what meanings and values it develops as well. Also, what semiotics-semantics systems such as tension, perceptual-sensory, feeling, aesTHEtics are related to light and lightcorrelated concepts? And is it possible to introduce a pattern for THE light system in SEPEHRI’ s POEM? Our hypoTHEsis is that THE light operates as a semantic-made word and it creates meaning through THE chained relation of senses and with interaction of different senses such as visual, sensual, tactile, olfactory and sensory-kinetics. In fact, THE incident lighting system prepares THE underlying light to form a sensory chain system. As a result, THE subject and object interact in this system and in THE perceptual-sensory relationship. THE result of such a process is THE presence of THE subject from transcendental presence. THE present study, by analyzing THE optical discourse system, has been able to present a model of how to transform and transcend discourse from THE perspective of light into SEPEHRI poetry...