In my renewed efforts at quest making, I've noticed something about my quest. In the dark areas, you don't honestly need the candle. Everything is completely visible, though slightly dimmed. It's a little harder to see if I turn off the interpolated fading, but you can still see blocks and things.
I noticed as well that in the 182 Test Quest, when you enter a dark room, things are DARK. Completely black. I'm wondering now, how did that work? Was it something to do with the tileset, or is there some trickery involved that I haven't discovered?