Brilliance
Illumination
Also Bright Light
Part of Illumination
Brilliance is bright IlluminationIllumination IlluminationIllumination is the light level that affects how you detect Targets using your Sense of Sight. with clear visibility and no harsh shadows, such as sunlight, strong direct light, and overcast daylight.
Core Rule—Brilliance
You’re ExposedExposed VisibilityExposed is a Visibility state in which you can be seen clearly, such as in Brilliance and areas of light fog or sparse foliage. to CreaturesCreature TargetCreatures are animate Targets, distinct from inanimate Objects. you’re ObservedObserved DetectionObserved is a Detection state you’re in when a Creature detects you with a High Fidelity Sense. by.
Source Player Codex