The Leviton Decora Smart DW6HD, DW1KD, D26HD, DW3HL, D23LP, D2MSD and DN6HD are all forward phase dimmers. They are also compatible with dimmable LED and Incandescent lighting loads. Furthermore, the DW1KD, D26HD, D2MSD, and DN6HD are also compatible with Magnetic Low-Voltage (MLV) lighting loads.
The Leviton Decora Smart D2ELV is a reverse phase dimmer out of the box, for smooth control of Electronic Low-Voltage (ELV) lighting loads. It is also compatible with dimmable LED, CFL, and Incandescent lighting loads. Furthermore, forward phase dimming can be optionally selected on the D2ELV to tailor dimming performance for specific LED lighting.
For applications requiring a reverse phase dimmer, please see the article How do I dim Electronic Low Voltage (ELV) or 0-10V lighting loads with Decora Smart® Wi-Fi?