It's actually symbolic a dhammic awarness-release formular, the four steps, candles, each sunday:
The Prophets' Candle, symbolizing hope; the Bethlehem Candle, symbolizing faith; the Shepherds' Candle, symbolizing joy; the Angel's Candle, symbolizing peace
Dukkha (4 Noble truth) => Saddha (tending to what is wholesome) => Joy (Right well-being, concentration) => release in certain peace.
If using it systematically, informed, attended by wisdom, hight release, far above sensuality can be gained over this time, giving ones customs good meaning, let them be explained well.