Can Lumen work with extended luminance range and real lux values in the DirectionalLight?

Hi everyone!!
My question is the one that comes in the title…
Does Lumen work well with real lux endirectionalLight values? (UE5 ea & preview 1 y 2)

I have been having the problem that I report in this forum thread (Thread). And after doing all the tests I can think of, I’m starting to believe that it’s a Lumen bug that doesn’t work well with high Lux values for DirectionalLight in rooms where no light enters.
The problem is fixed when I go down to lux values of 10, 15, and so on. when I go up to values like 150 or of course 130000 lux, the problem appears.

I have tried to change meshes Nanite and non Nanite, materials, meshes, make the walls thicker, etc… nothing solves it.

Can someone tell me if it’s a Lumen bug or am I doing something wrong? I can’t think of anything else to try.