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UE4 Ray Tracing direct light on glass material

the picture shows gray streaks from direct light through the blinds. There should be a soft diffusion and glow. But in place of this there is a dull strip. Can this be fixed today? Tried Pathtracer. The result is very good. If it is possible to somehow save this glass and transfer it to LIT, then this could solve the problem. Or are some settings enough? The glass material is simple. IOR = 1.5 | Spec = 1 | Rough = 0.05 | Metallic = 0.95