The Z-wave switch should work the same as any ordinary switch in this regard. Essentially you have a double switch going on here.
- The wall switch provides power to or interrupts power to the built in switch. When the switch is on (whether it be z-wave or ‘normal’ wall switch) power is provided to the next switch. When it’s off, power does not go to the next switch.
- The built in switch is obviously light based… If there’s power going to it (ie, Switch 1 is on) and the light levels are low enough, then it turn on.
The Z-wave will not sense that the second switch is trying to draw power and turn on, or that it’s stopped drawing power and turn off. It will work independent of what happens with the second switch.
So, for example, let’s say you want these outdoor lights to come on at sunset, and then turn off at Midnight. I’d set your Z-wave switch to turn on at noon (this way you know there will be power available to the lights whenever sunset happens) and then turn off at midnight.