By far the easiest way to deal with a burial chamber that I found for me is to craft a Stagbreaker (or similar area-of-effect weapon), lure the undead to the doors, close the doors and then bash in front of the door with the Stagbreaker. This will damage the undead behind. Use fire arrows for ghosts.

As for lighting up things, you can also shoot fire arrows at walls etc. to light up your surroundings. Works wonders in burial chambers and similar places, when the other options don't work for you. It's a bit expensive in crafting terms, but still works.