I'm building a magic system where magic isn't just controlled by human brains, but is actively produced there. As a byproduct, when casting a spell, the brain generates a large quantity of visible light (but not infrared light or heat). I don't know much anatomy, but I would imagine that, since human skin, eyes, and muscle tissue are all translucent to varying extents, it might be possible for people looking at the mage to see this light. It would mostly emanate from their eyes and nose, where their skull isn't in the way.
My question is: is this really how it would look if enough light was produced by the brain? And if so, what would be the health effects (i.e. could the person still see? Would brain damage be inevitable with repeated exposure?) Or would an intensity strong enough to see from outside the skull be guaranteed to fry the brain or something?
Note that while the light in this question is magical in origin, I don't want to have any arbitrary additional magic that protects the brain or rest of the body. Just accept that the person's brain is glowing (don't worry about where the energy is coming from), and use regular physics and biology from there.