A bathroom mirror light is the light fixture which is installed around the mirror or vanity cabinet. Usually it is a wall light which mounted on the wall, and over the mirror or on the side of mirror.
The mirror light purpose is to illuminate the face and eliminate shadow areas, making people easier to see themselves clearly when looking in mirror.
Because bathroom lights are usually installed in the middle of the ceiling, when we look in the mirror, our backs are facing the light. Our faces will appear dim and unclear, which has a great impact on makeup or facial care. With a mirror light, our faces will be very clear, so a mirror light should be installed together with the bathroom mirror.
Please note that a mirror light can also be a picture light, used to illuminate a wall picture.