What are the two common types of dive lights?

The identification of primary and backup dive lights is crucial in diving, especially in environments with limited visibility or at night. A primary dive light is designed for general use and provides the main source of illumination while diving. It is typically more powerful and has a longer burn time to ensure that divers can see and navigate effectively in dark conditions.

A backup dive light is essential in case the primary light fails. Having a reliable secondary light helps maintain safety and ensures that divers can navigate and assist others if necessary. This redundancy is particularly important during night dives or in murky waters where visibility is compromised.

The other options, though related to lighting, do not define the types of dive lights in a way that signifies their important roles in a diver's safety and functionality. For example, red and blue refer to colors used in various lighting applications but do not categorize dive lights effectively. Flash and steady describe modes of operation rather than types of lights, while LED and incandescent refer to the technology used in the lights themselves rather than their intended purpose or application in diving scenarios.