The latest energy laws are effective for specific incandescent lamps. Fortunately, most halogen lamps are still a viable solution for those customers with two-wire dimmers and those lamps are still able to be purchased.
For any customer interested in switching to LED or CFL lamps we recommend you consult
www.lutron.com/ledtool, as well as consult the lamp manufacturers recommendation. This will help you choose the matching fixtures and controls. You may find that that a neutral wire is required in order to properly control LED and CFL lights. Lutron is actively working on devices to support installations where a neutral wire is not available but the installation calls for dimming a CFL/LED.