The document discusses the use of lighting - both diegetic (part of the scene) and non-diegetic (added for effect) - in thriller film scenes. It analyzes how different lighting techniques like candlelight, street lights, projectors and emergency signs set tones like warmth, drama, and unease. Specific shots are examined where diegetic lighting is used to emphasize characters, create dark atmospheres, or hint at impending danger through the contrast of light and dark.