Probably less resistance through the host, and possibly lower vF on that batch of LEDs.
Out of caution, however, I would want to make sure that the LEDs are getting proper heatsinking---does the amp draw rise significantly after turn on? That is a bigger variance than I would normally expect.
Thanks! It is really hard for me to find the time to make videos, etc., but I'm trying to get better about it and set some time apart each week to work on it. Unfortunately it is usually late at night when I'm pretty tired. Can you tell? 
I was thinking about putting one of your light bars on my Drag Bike, you know for those Lights out, night time Grudge matches, but then adding another battery would add too much weight! 
But I did buy a new truck ! 
I thought it was a great video Richard!
I wish I had something to mount one of those bars onto. Unfortunately, I sold my Corolla a few years ago
What did you end up with?
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Here is a quick beam shot comparison video:
What I always buy, a GMC SLT Z71 :+1:
Nice truck! Half ton, or bigger?
1500,but it’s a 4X4, I just need to pull my 7.5’x14’ race trailer, 2 Drag Bikes, not into Horses or Farm stuff!
I know that a few of you have been waiting for them for a while now, but they have finally arrived 
:
Very interesting price… :+1:
I built a triple with XP-L2s of the 4000k variety and don’t like the tint. Will the Nichia 219Cs in 90+ cri and 4000k tint be any better?
Ugh, I built a quad XP-L2. I was hoping that the multi-emitter setup would help blend the tints and make it bearable. Still pretty ugly IMHO. But Nichia? Not sure I’ve seen a Nichia that I didn’t like the tint of.
If you like warm tints , you will love their tint .
Edit : lol , fixing the images now / Edit2 : fixed
So the XPL2 fits in the 10507 triple optic but not other triple optics, right? Does it fit in the quad optics, 10621 and 10623?
10621 yes---10623 I'm assuming no. 10621 is basically the same optic as 10507 and 10623 is pretty much the same as 10508.
Great, thanks. Any idea when you will get some more XPL2 types? Like V6 5000K for example?
Probably when the XP-L stock gets depleted, but in every application except for triples I prefer the original XP-L over the XP-L2 (and would even prefer them there except they don't fit). The rough phosphor construction of the new generation Cree LEDs leaves a lot to be desired, which is why I'm glad that Nichia has stepped up to the plate with the 219C and 319AT.
For anything reflector based I would always recommend to use the original XP-L or XP-L HI instead of the XP-L2. Optically they just work better and have better tint edge-to-edge than the XP-L2.
In general I also prefer the original XPL mostly because of its much higher luminance and throw (when dedomed), but for this particular light I want to emphasize overall output with a wider beam. With quad emitters under the carclo TIR, the lower Vf of the XPL2 will be advantageous for my purpose.
Understood. I really need to do an in-light lumen comparison between the 319AT and the XP-L2...I do know that the 319AT puts out some serious lumens (like 4000 OTF in a triple---for a few seconds at least ;-) ).
I’d be interested in that measurement. Judging from Texas_ace’s tests, the 319AT would pull even more current, but they weren’t as bright as we hoped, very close to the D320 219C output at a given current.