Which element is NOT typically used in dive planning?

Lighting conditions are generally not a primary factor considered during dive planning. Instead, the focus is on elements that directly impact the safety and execution of the dive, such as gas mix calculations to ensure an appropriate breathing gas is used for the planned depth and duration, emergency procedures to handle potential issues that may arise underwater, and the depth and duration of the dive itself to manage exposure to pressure and prevent decompression sickness. While lighting conditions can affect visibility and comfort, they do not directly influence the fundamental safety protocols or physiological considerations involved in dive planning.