Diffuse refers to the scattering of light using a diffusion material or surface, resulting in softened, less direct illumination.
Diffusion occurs when light is spread in multiple directions instead of remaining concentrated in a focused beam. As light passes through or reflects from a diffusing surface, its intensity is redistributed, producing a softer and more uniform output. Diffuse surfaces are typically matte, dull, or lightly textured, preventing sharp reflections and minimizing glare.
In commercial and industrial AV environments, diffuse lighting is essential for maintaining consistent visual conditions. Even light distribution helps reduce harsh shadows, prevents distracting reflections on displays or projection screens, and supports accurate color perception. These characteristics are especially important in conferencing spaces, broadcast studios, training facilities, simulation rooms, and controlled imaging environments.
Diffusion materials are commonly manufactured from glass, acrylic, engineered polymers, coatings, or specialized fabrics. Their diffusion properties depend on factors such as surface texture, thickness, internal structure, and refractive index. Some materials transmit light while softening its intensity, while others reflect light in a scattered pattern to create even illumination across a surface.
Diffuse surfaces are also used in equipment and product design to improve visibility and usability. Control panels, display enclosures, lighting fixtures, and sensor housings often incorporate diffusion to reduce glare and enhance readability in professional environments.
Diffuse lighting and optical behavior are addressed in standards and guidance published by organizations such as IEC and CIE.
The principles of diffusion have been understood since early optical science and were widely applied in photography, theater lighting, and visual arts. As commercial AV and industrial imaging technologies advanced, diffusion materials became more refined, allowing greater control over light distribution and visual performance.