Angering peaceful monsters by casting an innocuous spell like light is very annoying, so split the spell up into a “light area” spell, which does not damage anything unless it’s a highly light-sensitive monster like a gremlin, and a “light blast” or “flash” attack spell, which may or may not light the area permanently and is designed to blind monsters.

Archons’ light radius should be a passive aura area-of-effect attack that causes strong light effects: potentially blinding normal monsters, hurting gremlins and undead, petrifying trolls, and so on.

Shriekers caught in a flash of light shriek (however, this should only come from non-renewable sources to avoid being able to use them to farm monsters, or possibly this shriek should be unable to summon monsters.)

Undead caught in a flash of light (from cameras or just from casting an area light spell) get awakened if they were asleep or confused (with a chance that decreases at higher levels) if already awake. Possibly, just illuminating their space by carrying some light source near them should be enough to wake them up.

Hitting vampires or all undead with light should hurt them. Not to the extent of gremlins though.

Sensitive eyes intrinsic: you can see farther in the dark, but anything that creates light such as the scroll or a camera will blind you.

Sunglasses, an eye-slot tool that protects versus being blinded by flashes of light from things like lightning bolts, cameras, and yellow lights, either completely or with an 80% chance. (They probably shouldn’t block blinding from spat venom.) May also block certain gaze attacks. They should have some downside when worn, such as limiting your maximum vision radius or impeding searching.

Tourists start with a pair of sunglasses.