Lumen uses temporal accumulation to cleanly resolve. In other words, it takes multiple noisy images over several frames and blends them together to get a noise free image. If you flicker a light faster than the lighting can update, artifacts and noise are inevitable. There are some settings like the update speed and many cvars that can change the quality you could experiment with but this is ultimately a limitation with how the tech works. Nvidias ray reconstruction tech also sets out to improve this flaw in raytracing tech such as Lumen for DLSS compatible GPUs.
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