Since the beginning of civilisation the history of man is accompanied by the phenomenon of transcendent, something that goes beyond him, the question of where it came from and where it goes. Originally, the experience of God is given to man by nature. God dwells in the mountains, rivers, water, and divine reality is interpreted in analogy with the experience of light. In the process of the formation of religions there is continuity of the original symbols thus natural symbols remain the fundamental symbols of the divine nature. Light is a symbol present in all religions: sanscrit's devah, greek's Theos and the latin's deus that we translate God share a common root indoeuropeen's de'o, which means light. Light is therefore omnipresent symbolic determination of God. The light in a special way finds is interpretation through sacred architecture of different religions. Uniformly illuminated spaces, spaces in which light creates certain accents, floating dome etc., are some of the architectural appearances based on different meanings of symbols of light. The intention of this paper is to analyze the symbolic meaning of lights in the world's great religions Judaism, Christianity, Islam and Buddhism and the forms of architectural interpretation of that symbol through selected examples. Contemporary sacred architecture is faced with the problem of "forgetting the symbol" and of reducing complex phenomenon of sacred space on only sensoryc - aesthetic level. With this approach sacred spaces are increasingly perceived as "pleasant spaces for meditation", and they are becoming spaces emptied of meaning, separate from the inner sense which is rooted in the inner meaning of religion. The aim of this paper is to indicate that the use of light as an intangible factor of architectonic and identity of sacred architectural space goes beyond its primarly reasonableness above all in the perception of light in the context of the phenomenology of symbols and its founding in the religious onotology.