Replace your bulbs with Z-Wave capable bulbs instead of replacing the switches. In either case, what you’ll need is a Z-Wave switch with no neutral wire required. Sometimes there’s no neutral wire at a switch location if the power is coming through the light fixture. So, what if your setup isn’t that typical? Some black wires carry the return current too, becoming a black and white wire in one, basically. That’s the typical setup for most light switches, smart or otherwise, but Z-Wave switches are the most finicky when it comes to this. A light switch normally uses all three wires to connect to the light. In most houses, you have several colors of wire: a black wire that is your “load” or “hot” wire that carries the current from the fuse box to devices, a green (or bare) wire that grounds the current, and sometimes a white neutral wire that carries return current.
One of the most common is when you try to connect your smart switches into your existing electrical wiring and realize you don't have neutral wires! What is a "Neutral wire" anyway? When adding new Z-Wave devices or smart switches to your home, you can run into all sorts of little issues here and there. In addition to the actual switches, you need to think about the existing wiring in your home. One of the first things most home automation newbies want to replace is lights and light switches, but you want to consider your Z-Wave light switches carefully. Picking the Best Z-Wave Light Switch Without a Neutral