Dim Light
In dim light, you can somewhat make out shapes, but you can’t see precise details well at all. Dim light includes moonlight outside at night and bright starlight, or a starship’s emergency backup lights. An area just beyond the range of a light source has dim light. Creatures within an area of dim light have concealment (20% miss chance; see page 253) from creatures without darkvision or the ability to see in darkness. Because dim light is not ideal for observation, if you’re in an area of dim light, you can attempt a Stealth check to conceal yourself from creatures without low-light vision, darkvision, or blindsight. Dim light does not affect creatures with low-light vision, which can see in dim light as if it were normal light.
Source
Core Rulebook pg. 261