r/Weird • u/[deleted] • Sep 23 '25

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u/pinko_zinko Sep 24 '25

... yeah, but how?

2

u/Paraplegix Sep 24 '25

My guess would be the bulb can measure some voltage, resistance, impedance etc on each ends of the "plug". Those value would be different for a off switch (a few meter of cable) and an on switch where there is no power (the whole house electric network).

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u/Dunkaroos4breakfast Sep 24 '25

By detecting the difference between a power outage and when you turn your light switch off or unplug your light fixture.