When i render with lumen the result have some kind of little light bubbles.
Night with lights on
Day with lights on
Day with only natural lighting
Day with lights on
Day with only natural lighting
That is an unfortunate drawback of how lumen approximates GI and FG to be able to process in realtime. Essentially, your point lights (omnis and spots etc) that have more influence over the scene in darker settings are only casting so many rays leaving lumen to approximate in between.
Workarounds that I have found to be a little more helpful:
Try doing final renders in path tracer if possible. With no atmospheric effects, the quality overall will be better.
In Lumen settings in the ambience>render panel, try actually lowering scene detail to soften the dots, aka fireflies.
Try working with reflection probes if any of your materials have a roughness less than 100%.
Try adding some soft local area lights pointed upward (or even just some omnis closer to the surfaces that are affected most) with shadows off to smooth it out. Shadows being on clues viewers onto the lights location which you dont want since its not a real source.
Can you upload a viewport export with gizmos visible to see where your current light sources are and what type of light they are. In UE/TM you want to make sure you have actual physical lights and not depend on emissive materials to be what’s casting light if that makes sense.
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