Deformable lamp with anti-seepage

Doesn't the circuit diagram show 3 LEDs in series as a set, and there's 26 instances of those in parallel? Or am I hopelessly confused?

Steve Pritchard

3 LEDs in parallel and 26 sets of those in series. So each parallel circuit of 3 shares 300mA.

Big Clive

300mA across 26 sets of 3 in parallel is 11.5mA per LED (300/26) not 100mA per LED (300/3), isn't it?

Steve Pritchard

Seepage...it's not Gormenghast's "drainage", but it does have a certain appeal to the lowest of the low.

Michael Thompson

I have a smaller version on my porch. I removed one of the "wings" to make it fit where I needed it. Not driven nearly as hard as this one, and plenty of light. I think It wll last quite a while.

Chuck Kirchner

I may have scrolled past them on eBay.

Big Clive

It would increase the LED current.

Big Clive

Have you seen the mini version of these? They run at about 28 watts.

Gadgetman

What would happen if you swap the through hole resistor with one of a lower value?

Rasmus

I'm surprised the resistor value was so low. Another oddity is the space for a VDR/MOV with a transorb symbol on it.

Big Clive

My guess about the through hole shunt is the SMT is machine assembled and the T-H is select on test. Poke one in the hole and lean it sideways with a plastic stick. But given it's only a light and brain response is logarithmic, I'd've just aimed a bit low and don't bother with select on test. The thermal vias are also strange. S2M is rated 2A RMS and operated at less than 1A. They've also done it with the bleed resistors. Shotgun debugging maybe? Anyway, vias are almost free.

Mike Page

Half ohm fusible? Good luck with that. I tested a two ohm fusible and it shot sparky bits everywhere. The video looked like Star Wars. The problem is to dissipate say 10W in 0.5 ohm you're needing 4.5A. And at 240V that's over 1kW. So at melting time that power's being concentrated into the little bit of wire that's going to open and protect the load.

Mike Page

Try "DuckDuckGo"ing the chip. Sometimes it brings up what Gloogie refuses to show. DDG has become quite a lot better with time. Haven't used Gloogie for a couple of years now and I don't miss it.

Zeedijk Mike

Yes, but black is no tempco. I guess if you manufacture 6 band resistors, you need a way to indicate tempco does not apply.

No need to speed up the deconstruction process of the lamp. I enjoy these parts of any video as much as the rest.

Elim Garak

Maybe this resistor is 6 band, and this black strip is temperature coefficient?

Aleksander