I think a 3-light will probably work. A 2-light in a powder room, maybe, but you'll want something like 3x65W equivalents of light to get ready in the morning. As long as it's not wider than your vanity, a little larger or smaller than the mirror is not likely to be noticeable.

Thank you so much for your help! We actually do need the tower for storage as the bathroom is not very big at all. It currently has a bulky built in linen closet on the left hand side of the vanity and the current vanity is even smaller (60") that my husband and I have shared for 10 years. So while I'd LOVE more counter space, even the extra 9" we are gaining feels like a lot for us. We put the tower on the right because it is next to the wall when you walk in the door which keeps it from being in the middle of the room breaking it up. It helps that the top part of the tower sets back on top about 6" from the facing of the lower cabinets to make it feel less intrusive. I am concerned that a 3-light fixture may make it feel more congested, but I just don't know as it seems there would be room for it.. Is more light better or would a 2-light be better for scale? I do love symmetry, and you have no idea how much it pains me to not have a perfectly symmetrical vanity.. But it really is the best option for the space due to how tight the bathroom is as a whole. The tub is directly in front of the vanity (about 4.5' walking space) which also sits in front of a window providing a lot of natural light in the room.

"so if I use a 26 w by 36" tall would that look to overpowering" What's the purpose of having the mirror 2" narrower than the vanity on each side? I don't know what "overpowering" refers to.

Hello! Here are some of our examples for 60 inch double vanities with two mirrors. I have attached some pictures for reference on some of our vanities, mirrors, and medicine cabinets. The LED medicine cabinets are 24" and they are very popular! Feel free to click the links below to check out more options! Hope this helps! Click HERE for Vanities The oval mirrors are 36 x 24 inches. The rectangle mirrors are 32 x 24 inches.