Hard to find full beta playthroughs, but alright. I distinctly remember the intro, when you first go into a cave and it's pitch black. Bloodstains were all around the floor and helped guide you in a weird way, or you used a torch.
So here's a shot of that. Retail? No light needed, can see the edges clearly.
Other main spot was when you climb the stairs and get attacked from the left right through the doorway, with an archer across a gap pestering you. There are boarded up windows that could be broken to help see as it was, again, pitch black.
Retail...the same mechanic is in play. But this is with unbroken windows.