I had an odd similar issue with one Z-wave module that supported load detection. My guess would be that like the Z-wave module, the security light needs constant power to keep its detection circuitry alive. This draw could be telling the module that local power (via Amp draw) is requested.
I am fairly familiar with some of your other projects so will recommend getting a meter and experimenting/testing to see how much draw the light needs. Perhaps there is a way in the zwave-api to turn off certain features like local load switching?
To get around it another way you could use the zwave module to turn off a relay placed between the devices. Wired normally open this would allow you to kill attached devices regardless of any 'leaked-power' they try and pull. Good Luck.
I am fairly familiar with some of your other projects so will recommend getting a meter and experimenting/testing to see how much draw the light needs. Perhaps there is a way in the zwave-api to turn off certain features like local load switching?
To get around it another way you could use the zwave module to turn off a relay placed between the devices. Wired normally open this would allow you to kill attached devices regardless of any 'leaked-power' they try and pull. Good Luck.