Of course the Servant Songs in Isaiah gave the first Christians a reference point toward understanding some of the facets of Jesus' passion and death. This passage represents Old Testament theology's great respect for God, God the Creator, God the Sovereign Enlightener, God the Sovereign Victor. Ancient Israel experienced God as Isaiah 60 reports. It is as good an example of Old Testament theology as any paragraph therein, especially poetry. Ancient Judaism recited the sentiments conveyed in this text readily and repeatedly.
Light is frequently a symbol of eternal hope and assured victory.
It would give them hope that the figure of light shining, engulfing and guiding would lead to declarations of good news. Positive eventualities appealed to the scattered Hellenists. They could envision the figure of light as from the sun shining on all their compatriots wherever they had gone. The image of the light's and the illuminated's magnetizing all people to their sight might trouble the Hellenists some, if they were happily situated out from Jerusalem and reluctant to return for such an observance. They could appreciate the Lord's initiative and activity among the peoples of the earth, though.