Quote:
Originally Posted by Isayso
Thanks ozla
I need to check the temp
I think tha is above the 100 f
Thanks for the suggestion Twinfallz
Did you buy that heatsink locally?
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FIRST I'm not arguing against "proper heatsinks" but this isn't exactly what you asked about.
This is enough to passive cool 10W chips (at least for me for a few years b4 abandoning the build). Granted a lot of surface area and a lot of convection air movement arounfd the sink but not really very big.
Temps would easily go over 120F..
SECOND there is a large difference between cheap chips and quality modern chips:
Quote:
The XB-D LED, among many other new
Cree XLamp LEDs, is binned at 85 °C, so the relative flux data is based on 100% light output at an 85 °C junction temperature.
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That's 185F "at the core"...cheaper chips should probably be kept below 158f..
NOTE: That is at the core not the sink.
Easiest "fix" if you think the chips are heating too much is just tweak the drive current down a bit..
Less current less heat but oddly the LED's become more efficient..
Oh and yes black anodizing.. and even black paint radiates heat off the sink better than a raw or polished surface. Not needed for fan cooled though.
I've seen plenty of things that shouldn't work, work just fine..
Would it be my choice? No. But it's free, large and, if needed, can be enhanced w/ thermal pasting some fins on top..
Cheap 10W chips are like $2.50 each...
Again, heat sinking is complicated and even manf need to do Real world tests over any calcs and guessing..