Yes, the base of Calla and Lily are the same. It is the 40W power supply unit. The important thing is that the 40W power supply is only designed for a maximum of 5 lamps and not more than 40W. But both Calla and Lily need 8W per lamp. I myself operate a mix of Calla, Lily and the Outdoor Light Strip with one power supply unit. It works perfectly.