6x 20mm XML-ledboard comparison

The aluminum SinkPads turned out to perform well. Would ordinary aluminum MCPCBs perform the same when its dielectric will be removed just like the copper MCPCBs? :~


Copper hype… :slight_smile:

And compliments to Djozz for this interesting topic.

Pulsar13 wrote:

Seems to fit my style. How deep did you need to dig/punch? Got any pics?

Deeper than you would think. Those combined layers are thicker than I imagined. It may also be that I am compressing the underlying copper, but I try not to do that. Not sure if I have any lose ones around. If I do, gouge it and post a pic in the next day or two.

I have no idea how it performs. I'm guessing somewhere between the djoss' number 3 and 4 bases.

The problem is, how are you going to solder the LED to the bare aluminum?

Thanks DJozz! Though I think you might have your #’s wrong in the first picture. IIRC, the one with the tc cutout in the dielectric layer is the SinkPad 2. Backed up by the fact that the XM-L2 is of course a newer LED than the XM-L, it would seem odd to me for the “newer” SinkPad 2 (that you have listed as 5) to ignore the XM-L2, while the “older” SinkPad 1 would have it listed on the layer. I’ll pull apart my SupFire M6 to check—I need to lap those puppies anyway.

EDIT: Not really necessary, if you zoom in on the photo, the one you have labeled as 4 has SinkPad II written on the bottom, but listed as SinkPad V1 in the key, and the one you have label as 5 has SinkPad written on the bottom, but is listed as SinkPad V2 in the key.

Not a huge deal though :slight_smile:

You are completely correct, I mixed the two alu Sinkpads up in the first picture, luckily just in that picture, not in the tests themselves :-)

I will make a note in the OP.

WOW. Djozz. Once again, FANTASTIC work!

Very useful information to have.

Thank you!

Yeah I’ve been asking myself that same question too. :~

So I think I’ll do the same thing to aluminum MCPCBs what I’ll be doing to my copper MCPCBs - drill a 2.5 mm hole at the dielectric area then fill the hole with copper from an AWG 10 wire which is about 2.58 mm thick. That should do the trick (I hope). :slight_smile:


Thank you for this test and the well presented results even a non-tech person like me can understand easily.

I got one question, how good/bad will a 20mm noctigon board perform in comparison to the sinkpads ?

About the same. From our members’ tests, pretty sure we can establish now that the limiting factor is almost always the dielectric layer. Once that factor is taken out, even aluminium base gives performance not too far from Noctigon/Sinkpad.

Thank you Sir ! :face_with_monocle:

According to these high end tests there basically no difference.

There is a new MCPCB with a Diamond like dielectric structure. The dielectric functions like graphite which is used by high end fixtures manufacturers as a thermal pad, in that it spreads heat both vertically and horizontally and can provide performance of copper PCB, in a ALU PCB (cheaper)

do you have a link?

That is good news for the emitters without electrically neutral thermal path, like the Oslons :-)

Copper MCPCB Mod finally completed. :wink:

Thanx djozz for your tests. :beer:

Interesting results, thanks for the detailed tests.

I think where this is most valuable is in modifying those oddball size stars that Sinkpad and Noctigon don't have, 25mm in the Aleto 26650, 32mm in (I forget what). Maybe even triplet/quad boards?

Huge difference between direct heat path and one with the dielectric layer though

the basic details are below. a comparative guide between normal dielectric and the DLC

email me if you want details