Lumen is a global illumination system introduced in Unreal Engine 5, designed to deliver dynamic, realistic lighting and reflections in real-time 3D environments. In platforms like Arcane Mirage, Lumen enables developers to achieve accurate lighting simulations, soft shadows, and responsive reflections without pre-baked lighting setups or static light maps. Lumen utilizes advanced ray tracing techniques and hierarchical level-of-detail (LOD) algorithms to optimize lighting calculations and GPU performance, enhancing visual fidelity and realism in interactive applications, games, and virtual environments. By integrating Lumen, developers can create immersive scenes, explore dynamic lighting scenarios,and deliver cinematic-quality visuals with enhanced realism and interactivity using Unreal Engine.