I'm challenging myself with a sort of No Torches run of Minecraft. The idea is to use Furnaces as lanterns, and have them eat fuel both to be a light source on top of their use as a method of processing food and metals. While, ideally, this takes away PART of the challenge of the no torches run, a good portion of it is still present. If a furnace runs out of fuel, it's lights out, and that could mean death.
It also forces me to have a lot of coal or charcoal in my inventory to keep things lit, making inventory management an issue. It also makes wood far more a valuable resource this way.
I know there are mods that add similar functionality, but they also go above and beyond my need, and often add into it things I do not want, and often cannot avoid. Besides, this makes more sense to me, since the Furnace already can act as a lantern.
It also should not conflict with Forge, if possible.
I managed to make the mod.
The problem is when you put any coal to it, after the coal burns out the furnace burns out too.
So do not put any coal into the furnace.
This mod needs minecraft 1.4.7 to work though....