In my living room I have eight recessed LED fixtures. I have one that is directly above my drop-down movie screen that shines too much on the surface. I bought one of these z-wave switch devices to put in the fixture:
My thought is when I use an scene to dim the room lights for the screen, that one particular light could be shut off completely. The problem I’m running into is that when the lights come back up, the switch doesn’t initiate the light to come on, even though it is in the All Lights On scene. My thinking is that it needs 120V to operate, and it won’t get that until the lights come up to full brightness. So it’s not working.
I’m thinking that putting a one-second or so delay on the device would allow the fixture to come up to power, and then it would initiate the switch. I don’t know how to do that in a scene or on the device itself.
If you put your Z-Wave relay module on the same circuit as a dimmer, you will have a host of problems:
it’s not a dimmable device on a dimming circuit, which might be a code violation
it will power off or on based on some arbitrary power level when the other lights on the circuit are dimmed;
it could damage the module’s voltage regulator which is designed to keep the device powered with constant ac voltage.
since line-powered Z-Wave devices present themselves as network repeaters, every time this module loses power, any devices relying on it for connectivity will go offline until they notice and re-build their routes, leading to mesh instability
More bad news — the relay module pictured only switches its input voltage to the output, meaning you can’t use this — even if always-powered — concurrently with a dimmer. If you can run an always-on power line to this fixture, you would need to use a dimming module instead, and then sync its brightness with the switch using HA.
If you can’t change the wiring, your choices are (a) replace all the light fixtures with smart bulbs (which would necessitate switching to Zigbee / WiFi / Thread since Z-wave smart bulbs no longer exist), or (b) add a Z-Wave dimming module on every light fixture (which will get somewhat expensive). You can keep your dimmer switch, just remove the load wire and again use HA automations (or direct associations, if they’re all Z-Wave) to keep them in sync.
To answer your original question though — instead of a scene, you can use a script to turn the lights up, wait a few (probably 10-30) seconds for the dimmer to come back online and find the network and update its state, then switch it on. A better option: check the relay module’s Z-Wave parameters for a setting to automatically switch on (or restores previous state) after a power loss which would not require any HA programming. However, for the reasons listed above, this is not recommended.
