In the New Jerusalem God is light, and His shining is His glory. The shining is the coming out of the light. Hence, when God shines in the city, He is expressed in glory, first in and through Christ, and then in the city and through the saints. God is the light, Christ is the containing lamp, and the city’s wall bears the divine light to express God. Today the believers as children of light (Eph. 5:8) are the light of the world (Matt. 5:14), shining in the midst of a crooked and perverse generation (Phil. 2:15). Eventually, the New Jerusalem as a composition of all the saints will be the light-bearer, shining forth God as light over the nations around her.
".... and the name of the city from that day shall be , Jehovah Is There" Ezekiel 48. 35
God dwells in the temple, and He dwells also in the city. In the temple God has fellowship with His people, and in the city, God reigns among His people. (Recovery Version, footnotes)