What type of illumination is typically used for distress signals at night?

Distress signals at night are typically represented by bright red or orange flares or lights. These colors are universally recognized as signals of distress and are visible from long distances, making them effective for attracting attention and signaling for help. The red or orange hue stands out against the night sky, enhancing visibility and urgency, which is crucial during emergencies.

Bright blue lights are not recognized as standard distress signals; they may represent other meanings or services, such as law enforcement or safety vehicles. White strobe lights might also be confused with other signals and do not convey the distinct urgency of a distress call. Flashing greens or yellows, while they can be used for signaling in other contexts, do not have the same established recognition as distress signals compared to the traditional red or orange flares. Thus, the correct choice emphasizes the importance of color recognition and visibility in emergencies at sea.