@Pellape Our living room has eight very bright LED spotlights, I don't turn them up full because I'm fond of my eyesight but even when I do it's not lit like that, not that any of this is relevant, we can't compare real world lighting with the mess that is the lighting in this game.
I make comics using the game and I've lost count of how many sets (for want of a better word) I've built, one of the hardest things to get right is the lighting, too high and it starts clipping, then there is the problem of the way characters skin reacts to light, my character looked like a ghost in that vault and that was with the Imaginator lowering the games brightness to avoid the issue elsewhere. This screenshot shows an example of clipping, look at the front of her towel, there's no texture, the values are beyond what the game can display and the detail is lost. This is an example of light on a character, her face is white and the detail is gone, the lighting isn't as bad in FO3/NV as it was in Oblivion but it's still pretty awful and needs to be kept under control.
I've found the best way to light small to medium areas is with a number of soft lights, the ones with AMB in their ID rather than one or two really bright ones, there is a cost to it because light sources are performance heavy when mixed with NPCs, but that wouldn't be an issue in this vault.