# Lumen GI and Reflections feedback thread

**URL:** <https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108>\
**Category:** Rendering\
**Tags:** Staff-Pick-UE, unreal-engine, Lumen\
**Created:** [February 22, 2022, 9:01pm UTC](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108 "2022-02-22T21:01:05Z")\
**Posts on this page:** 1\
**Showing post:** 2426

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**Author:** ![GabBD](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@GabBD](https://forums.unrealengine.com/u/GabBD)\
**Post date:** [December 15, 2025, 2:45pm UTC](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108/2426 "2025-12-15T14:45:02Z")

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Hello! I’ve encountered a weird issue and I figured I’d cross-post it here since I’m fairly sure it has something to do with Lumen in conjunction with the volumetric fog.

I sometimes get small localized colored flashes at various locations in my scene. It happens while both in editor, playing, and in builds. I haven’t managed to find a way to reproduce it (tried moving the camera fast, in small increments, walking, running, etc.) Here’s an occurrence I captured:

![2025-12-0110-18-12-ezgif.com-video-to-gif-converter](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/f/5/7f5319f7fc04839716831b70cf526d8046ee6fe9.gif)

Here’s my original post for more info on my set-up: [Small, bright, random color flashes in Volumetric Fog with Lumen 5.6.1](https://forums.unrealengine.com/t/small-bright-random-color-flashes-in-volumetric-fog-with-lumen-5-6-1/2680882) (If anyone as any leads, I’ll make sure to update it as well). Thanks!

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_[View the full topic](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108)._