In other words, before the owner moves, all the lights in the house he wants to stay in will be on for three days and three nights. Only in this way can people move in.
Fire represents "prosperity" in China, and the fire temple certainly indicates that this family will be more and more prosperous in the future.
And if it lasts so long, it will last longer.
Another meaning is to drive away ominous things.
Generally speaking, in the dark, there always seems to be something ominous. If there is light, then these things will escape.
Therefore, turning on the lights for three days and three nights can drive away unlucky ghosts and gods in new houses, especially some houses called "Yin Zhai".