top light; skylight; roof light
Refers to a light source or window positioned at the top of a space, such as a skylight in architecture or a top-mounted light in photography/design.
This room has a skylight, so it's very bright during the day.
写真スタジオでは、トップライトを使って被写体を照らすことがある。
In a photo studio, they sometimes use a top light to illuminate the subject.