Renderings are essential for visualizing the effect of lighting in interiors, providing a realistic preview of how light interacts with various elements. Advanced techniques allow designers to simulate natural and artificial light, showing how sunlight filters through windows and how different lighting types enhance the atmosphere. These visualizations help assess shadows, reflections, and light diffusion, ensuring optimal fixture placement and lighting choices. By illustrating light's interplay with colors, textures, and furnishings, renderings aid in making informed design decisions, achieving the desired ambiance, and identifying potential issues before implementation.