Sorry for the long delay but sheltering-in-place with 2 active grandsons has kept us somewhat occupied (sigh). Anyway, I'll try to respond to all your comments, all of which are greatly appreciated.
dbwarner5, I originally had a MS I which triggered an Insteon 2475 In-Line on/off switch. This turned on the spotlights above the garage doors as well as the sidelights via an Insteon 2466 Switch. Dusk was signaled to control indoor lighting. That's basically what I did with the white/black/red/yellow connector wires. All was well until the MS I was obsoleted and the MS II came along.
oberkc, there's no place where I can put one that would not be affected by controlled lighting. I have lights coming on and off EVERYWHERE, including front porch and back deck. Also, finding an outdoor-rated Z-Wave device that reports light levels has been frustrating. And, yes It WAS outdoor rated; I still have the downloaded User Manual to prove it. In fact, I'm waiting for SmartHome to reimburse me for the 2 that failed since I purchased them for outdoor use (false advertising?). What happened? Probably went the same way of the Insteon 2494 Motion Sensor Floodlight -- an all in one unit that just magically disappeared. Amazing...
lilyoyo1, you're right about insuring Z-Wave communication, as the ISY is on the other side of the house from the garage and I'm not eager to build another network.
Working with the MS II was a bear; I had to create several additional programs to do the same simple tasks the MS I did all by itself. When I finally got it up and running and working, I then connected it to USB power. In retrospect, I think that's when things went south. My guess is that the unit can not keep moisture out when externally powered -- an issue when we sometimes get sideways rain here. That gave me an idea.
So I started looking into shielding the device from the elements. Found several suggestions using silicone, Saran Wrap, packaging wrap and the like. That gave me another idea. Since I have 2 dead units, I can use them to determine the ingress point and plug accordingly. If I can get a few microseconds to do so I'll try and report back.
That's my story and I'm sticking to it!