The other thing you can consider is adding additional point or spot lights near the torches to give the illusion of them providing more light. I did this in my own crypt level. You can see the comparison below of the ambient light provided by the torch by itself versus what it looks like when I enable a spot light that I added to the area.
Thanks Windemere. I'm looking for really dark though, with only a "lit by a the player's torch" kind of feel.
