Vanity Light Extension Box
It is new and installed in a regular box inside the wall the kind that has the bar and you just screw the lamp to the bar and use the center peg with a cap from the lamp to secure it.
Vanity light extension box. My vanity light is centered above the sink. Sigma electric weatherproof extension ring 2 gang gray metal weatherproof new work standard box extender exterior electrical box. Item 113 4fr detail. E26 e27 light bulb socket extender adapter e26 e27 to e26 e27 flexible extension all directional light adjustable converter for a19 led lamp recessed spotlight etc.
As far as taste i guess the extension itself can be painted same color as the wall but the internals of the light fixture will most likely stick out beyond the extension as they would in order to cover the back box and its hole in the wall. You just have to take the fixture off and see what shape size is the original box. It is a modern type bar with 4 lamps attached like this elk lighting inc. Generally any wall mounted lights will supply enough light even if they are flush mounted and the protruding surface mounted vanity is used if i am reading your description correctly.
4 pack 4 4 out of 5 stars 55 9 99 9.