I bought a Starke brand "Power Outage Backup" LED lamp from Aldi — see photos. It works in standard bayonet fittings. Most of the time it simply acts like a normal light bulb but during blackouts, somehow you can still switch it on using the normal power switch and it lights up for up to five hours. Obviously it contains a battery which is charged when power is available and used to drive the LEDs during a blackout but how can it detect whether the switch is on or not when there is no mains power?
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