this post was submitted on 14 Feb 2026
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I'm from Ukraine, so normal power is a rare thing. Most of us forced to experiment with DIY crazy shit in the scale of our budgets. So I have a 12V battery with a charger and I have found a DC 12V lamp to save some power on AC-DC 12V-220V converting. Sitting with a light is better than sitting in the dark.

But I start noticing that lamp is emitting light much more dimly than before. It happened gradually through 1.5-2 years, so the first idea was to blame the lamp itself. Shitty lamp working almost constantly for 2 years might started dying. I checked voltage. 13V from the PSU with battery. Ok. Replaced the lamp (luckily I had an unused one from the same set as the dim lamp) and... the same shitty dim light. But I wasn't completely sure that it was brighter 2 years ago. I could easily imagining things. Returned the previous 2 years old lamp. The light became much brighter. Almost as I remembered it.

Cleaned the contacts. All is nice now.

It looks like DC low voltage/amperage doesn't work fine with E27. Oxidizing is more significant in comparison to AC 220V.

I hope my story is dull enough for this community :)

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[–] itsathursday@lemmy.world 11 points 6 months ago

Dull but illuminating at the same time

[–] Aussiemandeus@aussie.zone 6 points 6 months ago (1 children)

Yeah low voltage allows build of of current affectors.

That's why outside powerlines don't really corrode.

25000volts is a decent cleaner haha

[–] seathru@quokk.au 4 points 6 months ago

Also galvanic corrosion is much more pronounced with DC vs AC.

[–] yaroto98@lemmy.world 5 points 6 months ago

Also happens if your contacts aren't solid, or if you're going copper->aluminum

[–] KickMeElmo@sopuli.xyz 3 points 6 months ago

Dull like your light, but you cleaned it properly.

[–] RobotFK@lemmy.blahaj.zone 3 points 6 months ago

Just as info: The E27 just means that the mount type is Eddison with a 27mm base