Quick Question about XM-L PCB Board

Torchaddict · May 8, 2012

Are these squares (in red) conductive? It would seem that there are +/- connections (another forum member pointed this out to me judging from the darker electrical pathway that can be seen underneath the first PCB layer), but I can't seem to get a low resistance measurement from my multimeter. Are they just labels for reflow/mounting orientation? If I placed a reflector (in blue) would it short out the LED?

More pictures:

AnAppleSnail · May 8, 2012

Per the cree datasheet, they should be conductive.

Google Image Search "XM-L wired macro" supports this.

Check your multimeter directionality and that you haven't gotten solder resin on the pads. That stumbled me for a bit with my XR-E builds.

Torchaddict · May 8, 2012

I see... Thanks!

Slickseth · May 9, 2012

Yes, they are bridged to the pads on the underside. But you would have to scrape away some of the silicone which covers them in order to test them.

Torchaddict · May 9, 2012

Hmmm... So would I NOT have to cover them up with something? With my setup, the reflector may rest upon this section. I have an o-ring (1mm) that the reflector rests upon, but the carrier PCB of the XM_l is 0.7mm thick, so there is about 0.3mm of tolerance. Add in the fact that the reflector is pushed down by the installation of the bezel, that 0.3mm may go down to zero...

Quick Question about XM-L PCB Board

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AnAppleSnail

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