Speaking of Samsungs, since I happen to have both stock and LH351D (4000K high CRI) right now, here’s a side-by-side shot with daylight white balance.
Just re-tested my q8 after recalibrating my sphere with the maukka lights.
I replaced the tail pcb with a copper disc and bypassed the springs with 20ga Teflon wire, passed through the copper and soldered. I also replaced the fet with a SIRA20DP. LEDs are stock. I also added the kaidomain AR glass. Brass screws on the driver and the tail plate.
I got 5,966 lumens at start and 5,586 at 30 seconds. I’m pretty happy with the results.
I like that, I have done a few like that, called it the inner bling, makes it a true keeper, well done my man! :+1:
Yours looks a lot cleaner though. Very nice. Makes me want to take it apart to polish it now. I did the super stiff springs that mtn offers. They’re a little skinnier diameter but heavier gauge and they got rid of the butt-bump blink.
Personally, I would have put the whole copper disc in a pool of solder, or electroplated it with nickel if possible.
Corrosion makes this look poor compared to the original tailcap, and it doesn’t offer any higher power throughput that the LEDs can actually accept.
It already uses 2mm thick copper traces, and that is already massive.
new order of 25 351D 4000K chips comming in… i’m doing mods on the Q8 if anyone wants in.
Butt Bump Blink! 
I added the 2 copper crush washer discs to the original springs because of the BBB! I polished it all up after building it and then cleaned/sealed it with NO-OX-ID “A” Special.
I love the NO-OX-id A special .
Asked my brother who works right around the corner from SANCHEM, INC.to go bang on their door with a pail in hand .
Maybe the connection between the backplate and the tube can be improved? Or isn’t this a weak link?
am i the only one wishing the Q8 had some sort of lanyard point?
YES i KNOW it has the 1/4 20 STD thread point but it doesn’t include the lanyard post like the GT and quite frankly, the Q8 NEEDS one more then the GT does.
anyone up for a new tailcap with a lanyard attachment option?
Has anyone done a Luxeon MZ swap? Led4power sell them on an appropriate MCPCB: led4power
How much more light would this give?
I debated doing it, but the amp draw would be silly and I don’t like the color temp that it comes in while I love the Luxeon V temp/tint in my Q8 currently.
How does the Luxeon V compare to the “stock” XPL HDs?
I love it. Barely any tint shift, just a nice even warm color temp.
How does the output compare?
I will do it, have the parts but did not come round to that yet.
Same for me. I don’t know if I find time in this year, to swap the LEDs.
I have already made a first mod with this Emitter, as written in “What did you mod today”. Thats interesting because of the diffusor foil to avoid the donut hole.
I will order “DC-Fix Milky” the next days for forther tests. Milky is realy great for max Lumen but not so great for max Lux, as discussed in german TLF: Diffusorfolien Test | Taschenlampen Forum
Output went up a bit. By around 1,000 lumens with the Luxeon V.
If the LH351D had been out at the time I would have just put those in instead tbh. They’re cheaper, higher CRI, just as or more bright somehow. Just the best of everything.
In a Q8, the LH351D would probably be really nice. It makes a nice, even beam and it would probably make the light a little less throwy.
Or XP-L HI should look really nice too, for those who want more throw.
I like the XP-L HD 3D it comes with, but in the Q8 it has a pretty strong rainbow effect. Needs some DC-Fix or a less rainbow-prone emitter to make the beam look more consistent.