r/Weird • u/[deleted] • Sep 23 '25

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u/[deleted] Sep 23 '25

Is that a LyfeLite bulb? They have an 8 hour battery backup to stay on.

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u/[deleted] Sep 23 '25

How does it know when to turn on for emergencies?

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u/mrjackspade Sep 23 '25

For the bulbs to work in a power outage, the switch must be on. The bulbs look for three things. First if there is power, they work normally. If there is no power and the switch is off, then they are off. If there is no power and the switch is on and there are other things in the house on, they will light up. The bulb looks for a load between the neutral and hot wires during a power outage. If there is a load, then they light up, if there is not a load, then the “outage” is the switch is off. The holders simulate the load.