What must be done when the flag is flown at night?

When the flag is flown at night, it must be illuminated to ensure that it is visible and properly respected even in darkness. The U.S. Flag Code stipulates that the American flag should only be displayed at night if it is appropriately illuminated. This guideline underscores the importance of maintaining the dignity and respect owed to the flag at all times, irrespective of the time of day. Proper illumination serves not only to highlight the flag but also to signify the respect that is traditionally afforded to national symbols, ensuring that it is seen in its rightful prominence throughout the night hours.

Other options primarily address actions that would not adhere to the regulations regarding flag display. For example, taking it down would not honor the flag's status nor acknowledge its significance. Folding it wouldn't apply unless it were being retired or stored, and replacing it with a lighted version is not a standard practice in flag etiquette as flags should remain the same regardless of the time of day.