off topic: junk led from China
(media.greatawakening.win)
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Sometimes I wonder if China is not only causing us to waste our money on this junk but at the same time causing us to fill up our landfills.
Was trying to use catbox to upload this image so I could create a text post but catbox didn't seem to be working, or it was me.
At any rate, not sure if China just produces just on purpose, produces junk because they don't know how to produce quality products, or produces junk because the companies outsourcing the manufacturing to them are giving them crap manufacturing instructions and asking them to work with crap components to cut costs.
These new LED lights which are supposed to last 10 years which you pay top dollar for are junk, at least the ones I've run into. I doubt there are any US manufacturers. I most likely purchased what I thought was a named brand at Home Depot. Probably got about 1,200 hours out of it. And as you can see it's probably only about 30% functioning. It probably was at < 85% long ago so probably a lot less than 1,200 hours at near full lumens.
I think the individual LED chips are overheating because the heatsinks aren't properly designed or implemented. In your photo example, nearly all the heat generated by the bright LEDs has to escape down the support wires and powerleads and it isn't enough heat sinking.
It is, the LED headlamps I've used in cars have some beefy heatsinks on them.
Are the heatsinks for the LEDs? I don't know much about car LED lights but just recently was reading up on some LED's an I guess an issue with the blinkers as they blink too fast, I guess due to not enough resistance. So I think they have a resistor mounted on a heatsink which mounts in the engine bay to fix the blinker problem.
I read an article which talked about LED's failing due to not being able to handle the heat. I'm curious why you say the heat has to escape down the support wires? Why is that?
There are three ways to shed heat here. Conduction, convection and radiation.
The conduction down the wires would be the main one I think, followed by convection in the air in the bulb and conduction to the glass -(I don't see why it would be a vacuum in the bulb) followed by infrared radiation which would be the smallest heat transfer.
I think this because the LEDs would be running at less than 100 degrees C so radiation losses would be smaller than an incandescent filament bulb where the filament is at 3000 degrees. Also, as mentioned by others in this thread, more successful LED implementations have big conductive heat sinks.