The lighting of this candle is a reminder that God came for the most unlikely and insignificant people.
By that I mean this, the first announcement of the Messiah’s birth was given to a group of shepherds! (Luke 2:8-14) There was not a more unlikely group to receive such an important announcement, unless maybe it was the Gentiles.
Think about it. If you were making the announcements who would you pick to hear it first? The high priest? The whole company of priests? The religious ruling body called the Sanhedrin? King Herod? All of these would be possibilities. But God chose none of them.