When not in the dark, remember to 'remove' your torches, glowing jars, or other light sources. This prevents them getting used up for no reason.
If you're used to TC you might forget to do this. TC has permanent light sources, like the Permalight flashlights or the lantern tattoo. You never have to think about it. Midgaard lights all burn out the more you use them. Remember to 'remove' them when you don't need them.