Well, in your map it's not really such a big problem because you use so many point lights they pretty much act as box lights; your story is more of a puzzle story and doesn't rely on the light/dark contrast that is almost necessary in a horror game.
But I can point out a few things...
http://tanshaydar.com/resim/white_night/...ot_005.jpg
Why is the pillar in the middle there suddenly pitch black? There are four very bright lights around it.
http://media.moddb.com/images/mods/1/17/...-26-07.jpg
The hallway here literally just cuts off from being well lit to pitch black, though admittedly this could be fixed with a single point light.
http://media.moddb.com/images/mods/1/17/..._000.6.jpg
On the left there in the middle of the painting, the light cuts straight from illuminated to pitch black.
http://media.moddb.com/images/mods/1/17/..._000.5.jpg
The windows on the right here look as though they're floating in mid-air
http://media.moddb.com/images/mods/1/17/...unnels.jpg
On the right the contrast between the lit door and the pitch black floor/area to the right is a bit sharp
http://media.moddb.com/images/mods/1/17/..._001.3.jpg
Again the contrast in the mid-right of the picture between the water and the pitch black wall is pretty sharp.
And some other lighting questions, that I'm pretty sure are just because the screens are old etc:
http://media.moddb.com/images/mods/1/17/..._000.2.jpg
I think this picture is pretty old and I'm not really sure what the context is (perhaps it's supposed to be this way) but the walls just cut off into pure blackness.
http://media.moddb.com/images/mods/1/17/..._001.1.jpg
Again this doesn't look like a lighting problem, it looks as though you straight up put black walls on the left there. But one never knows. >_<
And yes, I am being very nit-picky here. But I notice these types of things. ^^
Also remember, you can set a box light to "replace" instead of "add," so that it only effects the lighting of objects not touched by any other type of light (or perhaps also by lights softer than itself), or in other words the shadows.