So, I have a world where the sun sets for weeks at a time. It's setting when the (sci-fi)novel begins, and by the time the protagonist arrives, it's practically pitch out. Everything is being lit by torches, and the world doesn't have much technology(think steampunkish, but not the aesthetic of steampunk). I suppose they *could* have electric lights, but most of the story takes place in a castle made of stone where they wouldn't be able to run wiring. Candles work, but still flicker and are yellowish. I'm getting tired of the visuals provided by torchlight and want some other lighting source. The moon is rising, but it's not going to be enough light I think. Any ideas? I'm totally blanking.