Ask Jane: She has the answers - wall mounted bathroom sinks modern
How big the lighting should be on the bathroom vanity. Ours is 40” (over 3 feet) And there is a ship (raised sink)15”. The fixture on the sink should at least be the size of the sink ( Wall mounted two headlights) But it can reach 30 ". Make sure it's a little bit wider than vanity and you don't want it to be out of range because it will look out of proportion.