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Spiral Blur very dark

Hello there, I hvae been working with the spiral blur the last days and got it working, but it does not behave how I would anticipate. When throwing the material (simplest setup possible) into the scene, the material is blurring - but is incredibly dark. Even whren setting the blur distance to a value of 0, where the material doesn't blur at all, the material ist still that dark. Can someone point out if I am using the node wrong or is it a bug/limitation (because my scene is to dark?!). There are some screenshots: First a sphere with the material in the scene, second and third screenshots from the material editor. Thanks!

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Product Version: UE 4.21
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asked Mar 08 '19 at 08:21 AM in Rendering

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avatar image Dividuum Mar 08 '19 at 12:22 PM

Update: I played a bit with it around and found out that the material looks right when plugging the Result into the emissive channel - but then the material does not have any reflections.

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