Replace a standard switch with a Rotary dimmer to save energy and extend bulb life as you dim. You can easily turn the lights on and off with the push knob, or rotate to adjust the lights to your favorite level - creating the perfect ambiance and saving even more energy. Designed for use with an incandescent or halogen bulb, by dimming the lights just 25% you save 20% electricity and extend bulb life 4 times. You can replace your existing switch with a Rotary dimmer in as little as 15 minutes. The Rotary coordinates with Fassada® wallplates and accessories. Includes both white and ivory knobs. Save energy beautifully with Lutron.