- Ray Tracing Complexity: Lumen lights often involve ray tracing techniques to simulate realistic lighting effects such as reflections, refractions, and shadows. Ray tracing computations can be computationally intensive, especially when dealing with complex scenes or materials.
- Global Illumination: Lumen lights are often used in global illumination algorithms, which simulate how light interacts with surfaces and bounces around the scene. Calculating global illumination accurately can require multiple light bounces and extensive calculations.