Lanterns are used to ward off evil spirits, and lanterns are easy to attract ghosts. Ancient lanterns were called lamps instead of cages, the outer cover of lamps was called lampshades, and the door lamps were used as cages. This is a rule and a custom. Lanterns can be hung all the time, but red lanterns are not always hung. They can only be hung on festive occasions and festive days, while white lanterns are hung on white occasions.