ToME: the Tales of Maj'Eyal

And any other artifact with a power that's only really likely to be used outside of combat (though the Burning Star is the only one that comes to mind.) As it is, if you're not using it as your main light, it's just a pain to have to constantly switch it back and forth -- it doesn't cost you anything, since there's no reason to use it with enemies in sight, but it's annoying.