6x 20mm XML-ledboard comparison

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comfychair
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"My dog thinks that if he barks at a telephone he can make it stop ringing. Since the phone does eventually stop ringing, that proves he's right."

Hikelite
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Outside flashlight world, brass is considered a high thermal conductivity material actually. Also I remeber 7075-T6 aluminum which is a really strong alloy also being kind of blasted for being only 135W/m.K rather than 160W/m.K like 6061-T6.

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“My dog thinks that if he barks at a telephone he can make it stop ringing. Since the phone does eventually stop ringing, that proves he’s right.”
lol!

So never mind the artificial diamond then, the kind that conducts heat several time better than copper, yet does not conduct electricity.
I forget how it’s called..
It’s not even that expensive though.

comfychair
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No, if you're talking about what's right below the tiny little thermal pad of the LED, that's different. Much smaller area, so the material (or presence/lack of dielectric layer) does make a difference. But the contact area between MCPCB and pill, and between pill and light, is so much larger by a factor of whatever, that the thermal performance of the materials really makes very little if any difference.

Jerommel
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It’s called CVD
You can even buy small discs via AliExpress.
No dielectric layer needed as it’s an electrical isolator.

comfychair
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The cutter MCPCB being discussed earlier uses a DLC layer to bond the copper traces on top (which will readily accept solder) to the aluminum substrate (which will not readily accept solder). If the base material can be soldered to directly, there is no need for a dielectric or any other kind of layer inbetween.

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comfychair wrote:

“My dog thinks that if he barks at a telephone he can make it stop ringing. Since the phone does eventually stop ringing, that proves he’s right.”


Is this a quote from somewhere?

The Journal of Alternative Facts TM

"It is critical that there is a credible academic source for the growing and important discipline of alternative facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists"

 

comfychair
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Yes, but I can't remember from where. It's one of those things I stuck in my 'stuff I might find useful someday' text file and I didn't include the source.

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comfychair wrote:

Yes, but I can’t remember from where. It’s one of those things I stuck in my ‘stuff I might find useful someday’ text file and I didn’t include the source.


google had no clue, buts it applies to so many things in life that i want to quote it elsewhere

The Journal of Alternative Facts TM

"It is critical that there is a credible academic source for the growing and important discipline of alternative facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists"

 

comfychair
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For some reason BBC's 'Surviving Progress' keeps popping into my head, but I'm pretty sure it's not from that but something similar.

edit: No, scratch that. I went back and checked where that line was in the list, and it most likely was a comment from some anonymous person on a post at Wonkette.

hank
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I’m looking for info on Sinkpad2 Rebel boards — I got a few 20mm samples (they’re aluminum), but have been wondering if I can cut them down to 16mm rounds without blowing up anything important.

(or of course if there’s a simple answer — 16mm boards to fit Rebel emitters)

EDIT: I might’a‘known someone already tried carving down a Sinkpad; I’m guessing this will work for the Rebels also: http://budgetlightforum.com/node/34214#comment-667146

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As long as you dont cut the trace between the 2 little foot pads for the battery + and -.

If you leave part of the outer square + and - pads ( like if you only cut the board down to 16mm) it should be ok.

Or if you do have to cut in deeper for like a 12mm.    Then you would need to expose the traces that come from the smaller foot pads so you would have something to solder the wires to.

In Him (Jesus Christ) was life; and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not.
http://asflashlights.com/ Everyday Carry Flashlights, plus Upgrades for Maglite.

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