I purchased 2 of these mirrors 1 1/2 years ago. There was no knock-out in the back for the electrical so my electrician had to bury the wire in the sheetrock - bad design. 1 year after installation, the left light on one mirror went out completely ... unless you consider a greenish glow to be still operable - not good for make-up application. Apparently the problem has to do with the connection inside the mirror to the light that cannot be fixed. I've had to install other lights in my bathroom which aren't as ideal as having lights right next to your face in the mirror - now my mirror looks dark. I paid a lot of money for these mirrors and would have expected them to last longer than a year. I do have other Kohler products in my bathroom which are great but I'm terribly disappointed in these mirrors.