I have never had this problem before renders come out extremely dark no path tracing no branched. Blender 3.0 Looks very different from the display as being rendered did not have this problem in 2.93 I might not be fully up to date where Blender 3.0 is at
As in render display port while rendering:
Blender 3.0 Final
I would try the current Beta 3.0 version just to make sure you didn’t grab a bad 3.0 version.
Which renderer are you using (and does Eevee behave differently than Cycles?)
It is the beta version does so on both my pcs I suppose I have never known eevee to be anyway equivalent to cycles.In 2.93 it is ok brightness wise.
