Advanced Lutron dimming circuitry designed for compatibility with most high efficacy light bulbs. UL (Underwriter's Laboratories) listed to control dimmable CFLs (compact fluorescent) with integrated ballast, dimmable LED (light emitting diode) with integrated driver, halogen, and Incandescent. When dimming CFLs and LEDs, they must be Lutron compatible for optimum performance. 150-watt maximum dimmable CFL/LED, 600-watt maximum incandescent or halogen. Select light level with slider, slide down to turn off lights. HED Technology: advanced Lutron dimming circuitry designed for compatibility with most high efficacy light bulbs. Low-end light level adjustment to accommodate a wide range of bulbs. 100% factory tested.