Interest list: Q8 MCPCB with XHP50.2@5000K [DTP only available now at LED4Power]

Didn’t KawiBoy mod one? Anyways, from some Djozz tests, if the 4 emitters were to give 12,000 lumens, that would be “only” 32 amps. But if the conditions are ideal and pushing some 20,000 lumens, some 84 amps are going thru. The tests results for a 6 volt emitter, at 3 volts I doubled the current values (ballpark figures). If the FET can take it, then some other component will be frying. Any little resistance and much heat.

So basically, there would be some mods to push the LEDs to that level. I don’t know about the FET, but the tail spring bypass with some brass screws has usually been done on this light (anyone pushing the envelope). And as for the wires, that shouldn’t be a problem - lots of room in that cavity.

If the FET is the bottleneck, someone would have to chime in and give some before / after outputs.

And coming down to earth, pushing 12,000 lumens isn’t a bad deal for this light. IFAIK KawiBoy got some 16k lumes. I might never find it though (lengthy post).

Minor correction: the XPL footprint is 3535, the XM-L footprint is 5050.

I’ve done this mod (I was the person who asked Sofirn to make me an MCPCB with 3V XHP50.2s so I think I started the craze :smiley: ). A few notes:

It turns the light into an absolute weapon. I measured 16,800 lumens with my Maukka-calibrated sphere. This is up from 6440 lumens with the old XP-Ls. Other “performance” mods on my light include bypassed springs, brass driver and tailcap screws, Anduril firmware, AR glass.

Work involved with this mod is as follows:

- Enlarge the holes in the reflector - this is easy with an electric drill and a countersink bit. It’s a metal reflector so unless you’re being really ham-fisted, you won’t break it. And if worse comes to worst you can buy spares anyway.

- Enlarge the central hole in the MCPCB so you can get the bolt through that holds everything together

  • You will need spacers for the XHP50.2s - I asked Sofirn to include them

Heat-wise, its thermal mass really helps. It takes a while to get painful to hold. Some rough measurements with an IR thermometer on the body:

23c room temp
30c at 30s
32c at 60s
43c at 2.5mins, around 64c internal temp

Good information, thanks a lot Sir :+1:

Linked your comment in the OP.

Intrested, can the Narsil version be flashed to Anduril ?

It can indeed yes, very easily.
Undo the two driver retaining screws, there’s enough length in the wires to fold it back, clip on to the MCU, flash. TK has a Q8 hex file in her repository so if you already have the hardware you’re good to go!

I’ve also done this XHP50.2 mod and it does turn it into a bit of a beast. I used the led4power Q8 MCPCB however, so did the t-bar mod instead of drilling the centre hole out. I got the XHP50.2’s from sofirn (listed as 5300-5700k). With regards numbers, I’m seeing about 14500 lumens. That’s with stock driver, stock screws, and just a spring bypass.

Well that backs up my readings…

This reading on Samsung 20s ….hardest hitting 18650’s I have seen so far…

My reflector sits on the board… I didn’t use centering rings at all…but I had to use a thicker o-ring to seat everything…

Is that a 1:1 lux:lumen reading (divided by 10 obvs)? If so, that’s scarily accurate to mine! :o

Yep….This is the readings off of my 4” T/A maukka calibrated tube… our readings jive… imagine that

I asked for exact product code of “5300-5700K” and what bin 5000K would be, if they can source it. Will keep you updated.

Besided the Infineon FET quoted above, another favorite of mine is the SIRA20DP:

https://budgetlightforum.com/t/-/46241/1165

https://budgetlightforum.com/t/-/46241/1526

I've been using the SIRA20DP more as of late.

Barry wrote about a Q8 Pro prototype using 3V XHP50.2:

For the first (and probably last) batch of “5050 MCPCBs”: They are maybe reworked from ordinary Q8 MCPCBs, don’t know for sure. What I know is that 6 users having interest is surprisingly few :weary: . I’ll personally try to catch one of the LED4Power boards when the shop reopens next year. Will be a clearance sale, hope we all will get one.

In for one.
thank you

It should be noted that this thread may be not be heard at Sofirn. After some exchanges with Lan, the MCPCB that was made with XHP50.2s would have been modified 3535 footprints. Too time-consuming and effort.

As noted above, Barry mentions of some prototypes of the Q8 and SP36 with higher output LEDs. Best we second the initiative and voice our interest in the “What type of light would you like the next BLF Special Edition to be?” thread. link

bump

Count me in.

1pc Q8 MCPCP with 4 XHP50.2 3V (mounted).
If there are bare Q8 5050 MCPCBs, 2pcs… maybe more.

Put me down for 1 please. 5000K preferred.

Would love the XHP50.2 to be done in warmer tints, but it’s cree…

No better tints for the 3V version AFAIK. And up to now, Sofirn wasn’t even able to source another batch of them:

https://sofirnlight.com/xhp5023v-p0060.html

If Sofirn produces populated boards, we might have to decide for the 5300-5700K version. But then, it’s about power, isn’t it :smiley: .

I am officially in if the MCPCB is mounted with the four leds.

Will it come with centering rings?

Not really an update, but that’s the current state of affairs: Neither me nor (I think, haven’t heard from him since quite some time) Sydney are in contact with Sofirn in this matter. There was a clear ‘no’ to XHP50.2 MCPCBs (former ones were reworked original boards), and so we can only hope for the Q8 Pro project and that the geometry will stay the same. I concur it would make sense to sell gaskets along with the boards. In case the lights are similar enough, I’d even ask Sofirn for complete sets (board, reflektor, gaskets).