I've noticed an odd phenomenon with an adjustable-focus LED flashlight that I've bought.
If I shine it at the ceiling of my room at the widest possible angle, the walls get noticeably brighter than if I shine it at the ceiling of my room at the narrowest possible angle.
Of course, in both cases, the total light emitted is the same, and so is the center of the lit area.
Shouldn't the walls be lit by the same amount in both case?
Why does the surface area of reflection affect the outcome when the amount of light is the same?