Hmm, call me a cynic but I'm not convinced
. I guess it's possible in theory but in practice it would need to be constantly injecting a test signal into the supply and it would need considerable intelligence built into it. There's a couple of other issues as well such as during a power outage it would likely only 'see' the other loads connected to the installation(s) rather than the secondary side of the supply transformer. The impedance of the other lamps, transformers, ballasts, drivers or PSU's on the same switch circuit would also be an issue because this impedance would remain regardless of the circuit being switched on or off. Also if there was more than one of these things on a supply transformer they'd likely interfere with each other unless they all use a unique test signal.
I'm just thinking outloud here and I'll be the first to say that anything's possible so I'd be very interested if someone would purchase one and promptly reverse engineer it to satisfy my curiosity and let me know how it works
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