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Archive for January 21st, 2017

LED Filaments: Whoops

Five bucks delivered three sets of five warm-white LED filaments from halfway around the planet:

LED Filaments - 3x5 sets

LED Filaments – 3×5 sets

Unfortunately, the “Top Rated Plus” eBay seller just popped three ziplock baggies into an unpadded envelope and tossed it in the mail:

Unpadded LED Filament Envelope

Unpadded LED Filament Envelope

Which had pretty much the result you’d expect on the glass substrates within:

Broken LED Filament 1

Broken LED Filament 1

Turns out every single filament had at least one break:

Broken LED Filament 3

Broken LED Filament 3

Indeed, some seemed just as flexy as the silicone cylinder surrounding the pulverized substrate.

I reported this to the seller, with photographs, and got a classic response:

can you use?

No, I cannot imagine a use for broken LED filaments.

The seller proposed shipping replacements that would might arrive just after the eBay feedback window closed. I proposed refunding the five bucks. The seller ignored that and sent the replacements in an untracked package “as it is an economical shipping, we have to reduce our loss, so is it ok?”.

No, it’s not, but he / she / it didn’t actually intend that as a question.

Were the filaments intact, they’d pass 15 mA with 50 to 60 V applied in one direction or the other, for 1 W average dissipation. That’s probably too high for prolonged use in air (spendy bulbs with similar LEDs have argon / krypton fill for better heat transfer), but I can surely throttle them back a bit.

Perhaps the replacements will arrive before the feedback window closes?

I did order another batch from a different seller that might arrive intact before then. We shall see…

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