Yep, perfect. 
Well, from what Eric587 reports I can infer the Vf of those SPHWHTL3D50GE4RTMF LH351Cs must be low. This means that Q8 is better served with LH351Ds or the stock emitters.
By the way, how big does the LH351Cs' die size looks to be? 
Curious, it works for me. 
Just to be clear Barkuti, the emitters in both my Q8 and M2 are LH351D’s. I did not purchase any of the LH351C’s.
I have also just removed the bypass wire from the driver spring of the M2, which fixed my blue tint on turbo problem. It actually seems brighter now on turbo, which suggests that it was getting too much current. Still get’s hot very quick which is to be expected.
Maybe I got an odd 351D with very low forward voltage? The 4 in the Q8 handle it’s turbo fine.
Wellp, thanks for pointing it out Eric587. I've been reading bits and tips of this thread here and there, including Bob_McBob's comments, and somehow I got mind messed.
Yes, everything's possible. This is why I love regulated drivers. Look at this regulated MOSFET premiere: 3000mA 3-Mode LED Flashlight Driver Circuit Board @ FastTech
That driver uses an AON7520 MOSFET (50A rating and super low VGS), plus sense resistor to regulate maximum current. :THUMBS-UP:
Lightbringer is gonna have a laugh. 
Cheers ^:)
The M2 is a good host, but upon receiving the first prototype of the Q8 I was very surprised at the extremely good heat handling of it. That may add to why the same leds in a Q8 perform better.
That certainly makes sense, thanks guys :+1:
I installed four of the 5000K LH351Ds (SPHWHTL3DA0GF4RTS6) in a brand new Q8, and the output at turn-on is only 50 lumens lower than stock (5102 vs. 5048). Tint is significantly less green-yellow than the LH351C I previously tried. I much prefer the 4000K LH351D, but that is more personal preference. I will put together a video tonight comparing 4000K and 5000K LH351D to stock XP-L in the Q8 since I happen to have three at the moment.
I put an LH351D in a Wowtac A2S. Lost 40 lumens (1040 -> 1000) and not much change in intensity or beam pattern. Tint looks like a 5000K 219C, but less green. Color, unsurprisingly looks great.
Stock XP-L ~4500K left, LH351D right:
The camera settings are the same, and there’s no significant difference in intensity. The XP-L is overexposing the green channel. I am trying to convince Wowtac they should sell them this way.
Looks really good zak.Wilson, thanks for posting up the comparison pics. :+1:
4000K and 5000K side by side in Q8s.
Bob how does the 4000k LH351D compare with a 4000k 219c? It looks rosier to me judging by your picture.
Should be noticeably rosier at high currents. The Nichia don’t change as much with increasing current.
Oh man, that $0.34 deal would have opened the door to modding my showerhead lights.
Subscribing to this thread for the Maukka tests.
It was a really nice deal and I wished i was smarter and had bought more ..but these emitters are already really cheap anyway.
Great shots bob mcbob ..
*note to self :hold off on killing bob mcbob
The LH351C MF ones that were super cheap are a bit worse in tint than the more expensive but lower flux bin KF ones.
Measurement from the hotspot at 1 amp with a Yajiamei 10° beaded optic.
Rated (700 mA)
1000 mA
2000 mA
3000 mA
4000 mA
5000 mA
Output seems to taper off after 4 A.
Pretty much zero tint shift within the usable beam using the Yajiamei.
However, very visible green tint in the corona with the X7 SMO reflector
You say output seems to taper off after ≈5A, this means their die size is small, doesn't it?
Ouch with the tint! Slightlly less than promised CRI.
I have 3x LH351C MF pieces on the way, if they dedome right they may be a great emitter for throwers.
Cheers ^:)
The die is quite small yes, not quite as small as the 351B. The KF ones were better in tint but the one I tested has much lower output and tops off at about 3 amps. So filtering the green out on the MF is better. I did the output test with one sample each so YMMV.