Dynamic HDR

Is it possible to make a hdr, that changes on darkness.
Like if your in a dark area, it turns down the brightness and when your in a bright area, it turns up.

Sounds like you mean something called eye adaption and there already is a effect for that in the official repo. It's called, conveniently, EyeAdaption.fx.

I have a issue.
Light brightness works fine, but darkness doesn´t work.