Light

All rules references

Levels of LightDescription
Bright LightIn bright light, such as sunlight, creatures and objects can be observed clearly by anyone with average vision or better.
Dim LightAreas in shadow or lit by weak light sources are in dim light. Creatures and objects in dim light have the Concealed condition, unless the seeker has darkvision or low-light vision, or a precise sense other than vision.
DarknessA creature or object within darkness is Hidden or undetected unless the seeker has darkvision or a precise sense other than vision. A creature without darkvision or another means of perceiving in darkness has the Blinded condition while in darkness, though it might be able to see illuminated areas beyond the darkness. If a creature can see into an illuminated area, it can observe creatures within that illuminated area normally. After being in darkness, sudden exposure to bright light might make you Dazzled for a short time, as determined by the GM.

Section: Playing the GamePathfinder Player Core pg. 432