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I think it's some sort of bug. For what I've figured out with my unexisting java/modding knowledge, when the helmet emits light is seen as an entity similar to a block by the cave. A bug, but yet really funny.
This seems to be the case with a lot of the light mods, so I wonder if it has to do with Minecrafts way of creating block lighting. I've heard of issues with the wrath lamp and some other light where they have an invisible entity below them that actually casts the light. This has caused problems such as a tree farm not having enough room to grow.
