Using dimmers with bathroom lighting gives you complete control over the lighting of the room, depending on the need at the time. You can dim the lighting when soaking in the tub, or turn it all the way up when applying makeup or shaving. Dimmers also save a lot of energy. When using the lighting on the lower settings, you can save up to 10% of the energy expense. You only need ensure that you are using the correct dimmer for your lighting fixtures.