"Group Buy" Interest: Q8 MCPCB for Luxeon V/SST40/XML/XHP50 Emitters

I know that this niche is too small to be worth creating a PCB, but I’ll mention it anyway, just to float ideas that may get useful in another time in another place.
I’d be interested in a PCB created specifically for Luxeon M/MZ/MX.
It would be different from a Luxeon V one in that the pads should be shifted somewhat to the centre and rotated 45°, to focus the reflector on the outermost dies.
This should remove the hole in the middle of the beam, resulting in a nice, bright, small hotspot surrounded by large corona.

Great initiative! The Neal route stopped at the point that it became quite confusing already. I do not regret atm to not continue that route.

I hope that someone already has precise dimensions, or else I will open up one of my Q8’s this afternoon.

Good to hear someone is picking this up, I still want to put xhp50.2’s in mine.

Far as the pcb design goes, the final design I made should be what you need. The earlier designs were based around the prototype Q8’s and are not relevant anymore obviously.

PM me if you would like help with this, I have the source files around here someplace.

I would be in for 2 of these boards.

led4power I appreciate your initiative A LOT! I’ve been waiting and hoping for this to gain traction, but after it being quiet and having no convenient way to split things up amongst ourselves I was growing worried.

You can add me for 2 more boards (total of 4)

Thanks, but I only need LEDs/screw holes etc. positions, I will make gerbers according to my manufacturer spces/rules.

Should I open new Interest thread? Because I'm not sure how relevant is current list, there is possibility some members gave up after lack of activity in this thread.

I think that if the board is available, people who are in the list will just pick up their Q8 and start modding it. And I think that with the first succesful mod come new people buying the ledboard. Especially with ready mounted Luxeon V’s, the mod is doable for many many people: instant 8000 lumen in good tint (well, if the center pieces are succesfully reamed :innocent: ).

I guess I will have to unsolder the ledboard on one of my Q8’s and do some measurements on the hole positions. In TA’s design the two small screw holes were dismissed because they did not fit in the 4040/5050 double design, but who knows you can squeeze them in.

Would it make sense (or even be possible) to use rotated LED pads?

I hope Lazy-R-us can update list because last update was on 01/01/2018.

All fresh measurements on a production Q8 board:

Thanks!

What are those two smaller center holes for?

They are for the led wires.

The two small holes further out screw the board onto the shelf in the first production run, in the later production run they allow longer screws from the underside of the shelf through the ledboard into the reflector (clamping the board between reflector and shelf). In both cases they prevent twisting of the board when closing the bezel. If you leave those holes out, clamping of the ledboard to the shelf is leftover to the bezel, while risking twisting the board with closing the head. It will work but it requires some care when closing the head.

Central hole is used to clamp PCB+reflector to body?

Central hole is “only” to coamp PCB + Reflector together. The body/shelf diameter is much bigger.

I thought I can rotate LEDs around PCB center so I can fit both 4040 and 5050 on one PCB without interfering with screws, but I can't because screw cavities in reflector allow for only one position (45deg).

There is one solution - using flat countersunk screws for PCB clamping, is that ok?

That means pcb must have countersunk holes, but I think it's doable by factory.

Except that in all but the first 500 Q8’s the holes in the shelf do not have threads.

Edit: the first 500 may not have threads either but the screws were just forced in.

Edit2: can someone else help out further?, I’m rather sick atm, need stop doing things for a while.

Interest list updated. Current to here.

led4power, thank you for looking into this and hopefully taking it on!

firedome, how many boards are you interested in? You have a post at 60

and a post at 88 :

You are currently in the list for one.

For the first 500 flashlights, the Screws holds the MCPCB on the shelf/head of the Flashlight.
On all other Q8, the Screws go throu the shelf, the MCPCB and screw into the reflector.

I would say, do not care about the first 500 (I have two of them and one later Q8) and make 4 holes near the LED-Pads.
For the first 500 everyone have to find a solution, e.g. with countersink screws, or without screws (clamping all together with an adapter/old mcpcb over the centerscrew of the reflektor).