Continual light

Continual light is a cleric and wizard spell that emits light equivalent to full daylight which lasts until negated magically, such as with dispel magic. It can be cast at a point in the air, onto an object, or onto a creature. An unwilling creature can avoid the spell's effect moving with it.

If the spell is cast directly on eyes, it can blind the target creature. If cast on an area of magical darkness of equal or lesser power, the two spells cancel each other out. Eventually, the material on which this spell is cast will disintegrate, but usually not for hundreds or thousands of years.