From a user:
when I use HDR rendering, front of designed booth is dark
You might want to try rotating the HDRi sky to see if that makes a difference. An HDRi image typically has a main light source, like the sun, which casts shadows from a certain point.
Here is a model which I rendered using an HDRi sky with no rotation:
Notice how most of the light seems to be coming from behind the model.
If I rotate the HDRi Sky 180 degrees, I get this:
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