Lighting is a key technical element in film that helps tell the story visually. The document outlines a lighting plan that uses natural lighting and bulbs to achieve a low-key lighting style typically seen in suspense and mystery films. The goal is to make the scenes feel realistic and attract the target audience. Lighting serves three main purposes - providing a clear image so viewers can see important elements like facial expressions, creating an emotional impact, and being an important part of the visual design of cinema.