Unlike Hannukah and Kwanzaa, all the candles are all lit at the beginning of Lunar Twlight. Each night a candle burns out completely, which will be the shortest, to represent the passing of a day. When the shortest candle burns out, the others should be blown out before the dawn of the next day. Then on the next sunset of the day afterwards the remaining candles are to be lit, whence the next shortest candle burns out in the manner, until none are left.
The celebration of Lunar Twilight is a universal inclusive celebration to mark the passing of time for any person of any heritage, faith, nationality, gender, or path to appreciate our connection to the heavens by ancient traditions and modern science revelations, or a mixture of both.
It won't be until January 7, 2019 that the first Moon of 2019 will be. And if you want to get ready for January 2020, there will be 23 extra nights of 2019. That means, we have to wait until January 25th 2020, for the first cosmic night of 2020, because that is when the first Moon of 2020 arrives.
Thus the last echo of 2018 burns out at high noon GMT/UTC January 7, 2019. The curated 2018 Lunar Twilight Goodbye Song that captures the feels of this holiday is an INXS song, Afterglow 2006