What fixture? You did not attach a photo.

The best bathroom lighting, if you have room right and left of the mirror, is to use wall-mounted sconce lights (2), mounted about 65" - 72" from floor. (this depends more on the height of the inhabitants) This provides more evenly distributed lighting on the face, especially for applying make-up or other hygiene activities. Go to www.directlighting.com and do a search for sconce lighting.

opps, I meant www.lightingdirect.com