What effect is created by positioning a higher surface light over a lower one?

Positioning a higher surface light over a lower one creates a pointer effect, which helps divers orient themselves and establish a clear direction or reference point underwater. This effect is crucial during night dives or in limited visibility conditions, as it serves to direct attention and convey specific navigation cues. The contrasting positions of the lights can highlight pathways or important areas, making it easier for divers to follow a designated route or identify key landmarks.

In challenging diving environments, the pointer effect becomes a vital tool for improving safety and enhancing the overall diving experience. It helps mitigate disorientation that can occur in low visibility, ensuring divers can remain oriented and aware of their surroundings.