I found a fix and it is indeed auto exposure! Enable auto exposure in your project settings, drop a post process volume in your level and check UNBOUND. Under the Exposure settings in your post process volume settings, set Min Brightness to 1 and Max Brightness to 1. I also have check boxed Metering Mode and selected Auto Exposure Histogram in the drop down, Check Exposure compensation and set to taste. I set mine to 2. This setting depends on your overall light intensities and how much you are cranking up Indirect Lighting Intensity from each light. Lastly check box Apply Physical Camera Exposure. Works great now. No more unstable GI and Pulsing effect. So stoked! Love Lumen!
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