Author Topic: The Cheap Chinese Bulb That Won't Turn Off  (Read 667 times)
LightUpMyLife
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The Cheap Chinese Bulb That Won't Turn Off « on: December 26, 2022, 04:46:40 PM » Author: LightUpMyLife
Caught this interesting video recently. Does anybody on the site have these bulbs?
https://www.youtube.com/watch?v=1uEmX5XClPY
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Medved
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Re: The Cheap Chinese Bulb That Won't Turn Off « Reply #1 on: December 26, 2022, 06:34:07 PM » Author: Medved
On quite a few places I'm even adding a capacitor to make a kind of "nightlight" function out of it. Pretty handy when you have to go at night, you do not have to wake yourself fully up by a bright light when on the way there or when you need a sip of water... Consumes less than 100mW per room, so on the electricity bill not visible at all...
Of course only outside bedrooms...
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AngryHorse
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Re: The Cheap Chinese Bulb That Won't Turn Off « Reply #2 on: December 27, 2022, 03:34:24 AM » Author: AngryHorse
Good demonstration but not accurate!, nobody has 100 metres of T+E to any switch in the average UK home!
There’s probably 5 or 6 metres at best, even in a large room?
And as Medved says, it probably makes a cool nightlight when it is just using the ‘stored electrons’ in the cable?
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marcopete87
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Re: The Cheap Chinese Bulb That Won't Turn Off « Reply #3 on: December 31, 2022, 03:25:12 AM » Author: marcopete87
It can happens with all sort of bulbs.
It happended also to me with an old installation and a CFL: cfl started to flash randomly after turning off.
This was caused by the combination of:
- humidity
- old cabling (with rigid copper)
- old porcelain switch

Relative high leakage current caused cfl capacitor to charge and, after a certain voltage threshold, tried to start CFL which drained capacitor and the cycle repeated itself every 5-10 seconds.
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