off topic: junk led from China
(media.greatawakening.win)
You're viewing a single comment thread. View all comments, or full comment thread.
Comments (28)
sorted by:
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.