4x quad XP footprint copper DTP stars my dears! :-)

Hey I am just repeating what they say :wink:
I thought the XHP50 was compatible with XML/XML2 footprint, that the XPL (hi) is different AND that the XHP70 needs larger pad
You write about XPL footprint and description says 7070 so sorry I am really lost here

Description is wrong, what you see is 4 xp’s 2s2p so input voltage is 6V or maybe 24V if using quad XHP35’s

Have you found if they are indeed dtp?

LightRider, the vendor told me they are not. However, in my experience, lots of eBay vendors know actual Jacksheesh about their products.

Look at this photograph I took of an XHP70 baseplate I received from FastTech which actually is DTP:

This board probably came from the same factories the ones this vendor has. Take a look at it, you'll see the thermal pad is somewhat “depressed”, you may be able to spot a circumventing line around it: that's because the dielectric layer is missing there.

I see the same on those quad 3535 boards… if those are actual photos of them, I'd bet they are DTP. Of course I may be wrong on this… but you can see my point.

Cheers ^:)

^ Astute observation. The board in the OP does appear that it may be DTP. The 3 volt 4 up XP looks interesting. Anyone know any optics that might fit it?

I’ll definitely be buying some. Next project QX7Q Photon Cannon.

It is like building your own XHPxx
And one can mix different tints.

can someone please explain to me what is Thermoelectric separation and Direct thermal path?

ImA4Wheelr, as far as I can see on the different board pics, I see a proper top copper layer layout for the 6 & 12V versions; that is not the case for the 3V one, which looks the same as a 6V. In a 3V baseplate the central strip interconnecting all of the leds' inner leads should be one (maybe the negative) pole, whereas the other pole (maybe the positive) should have tracks embracing both sides.

Definitively fishy yet, as I said, lots of eBay vendors know @#$% about the real product, maybe the real vendor hires a handful of employees with multiple eBay accounts (in order to flood/monopolize the search engine) and gives them generic pre-designed item ads; they do nothing more than telling daddy “send this or that to Joe/Jane Blowsgoats” and answer clients' questions the best they are able…

Bruno28, led baseplates usually are Metal Core Printed Circuit Boards, which means they need a dielectric layer to isolate the core from the track layout, and this dielectric's thermal conductivity (thermal goo class ±) is a bottleneck with regards to maximizing heat transfer from the led die. In Direct Thermal Path boards the dielectric is nonexistant where the led's thermal pad goes, so solder goes in there for at least a twentyfold heat transfer ability improvement on that layer surface.

Cheers ^:)

Original post date: Mon, 09/05/2016 - 12:45. Information added; grammar fix.

Thanks for explaining :slight_smile:

Looked it up and found this image, hopefully helps someone that didn’t know like i didn’t.

Imgur

This seller has some very low prices on Cree LEDs. Makes you wonder though…

Been browsing the store and Yes I am wondering. They carry some crazy SHtuff and stupid low prices. They need reflectors to match the odd stuff.
Even if the pics are Genuine Cree, what are you going to get?
Want XP-G2 neutral on 12mm but I am hesitating on the click.

Think I am going to stick with Simon on these.

I see what you mean. Weird how the 3V and 6V have the same scratches (underneath the solder resist). I ordered some of each last night. I’ll report back when they arrive.

I´ve bought 20 x 3V bases and 2 x 6V boards with CW XP-G2`s on it. I will report when they are good ones.

Robert

CRX already has that image in his LEDs & other stuff thread. It’s stickied and chock full of similar good info. Not a bad place to spend time learning.

Received my order of 3v, 6v, & 12v 4-up XP and a XHP70 bases. They look great and are DTP. So the OP’s suspicion is correct. Thermal pad is nice and close to the top surface. Wondering if the traces are thin. They appear to be so, but the solder resist is thick and may be creating the illusion of thinness.

Oh, the 3v is indeed 3v and the 12v is 12v. Appears to be a pretty good deal.

Sounds good. Have any plans for them?

Reeaally cool! :CROWN:

Trace thickness matters, but also its width.

Is the 3V board layout as I presumed? Pics?

Regards,

Salvador ^:)

!!! !

Beamshot or numbers? I am curious how it compares to an XHP70.