Thanks. I wasn't sure what the purpose of it was, but thought maybe just as an extra protection not to damage
the battery sleeves or something like that.
That is quite a few soda-can-style lights. What do you use them for?
I have a few also, but not that many. Original Skyray King, Blackshadow Terminator, Meteor M43, BLF Q8, and ROT66. But I pretty much only use the BLF Q8 and the ROT66. The Q8 is because I have a 3D-printed diffuser cap for it so it works really well in candle mode. And I use the ROT66 because it’s smaller and has a gorgeous 219B beam.
belt, suspenders, velcro, and elastic waist tabs? 
Damn skv, you got a nice collection.
Newlumen, I see from your new avatar that you must really love your ROT66
ToyKeeper, I actually hardly even use my soda-can lights. I used them a few times for work but they are actually too big to carry around and I need to take pics with my other hand so I stick with smaller lights like TC20, C8F, Armytek headlamps, Acebeam H15, S2+ etc. I have used the soda can lights to ceiling bounce for indoor picture taking and took it out with friends to play around with. Otherwise I just enjoy collecting lights. It’s flashaholism at a feverish level. Hopefully I find good use for them some day.
My mistake. It was twisted raven who has the LH351D version.
Thanks for all the comparison info!
Actually I am getting my rot66 Samsung 5000k from skylumen54 Friday.
What is the difference with the skylumen rot66?
He just installed 9 samsung 5000k led and warranty. Thats it. Basically i am paying $100 to do the job.
You like the ss 5k better than the xpl-hi 5k?
I dont know yet… i am getting it tomorrow… samsung 5000k is 80 cri, and 6000 lumen… i will test output and beamshot tomorrow.
Anyone with a rot66 with the xpl hi ?? Can you guys post lumen specs ?
Compared to my other lights, it seems to be about 7000 lumens or so. Would be nice to know how close my guess is if someone can measure it accurately.
Yea you are right… i check out skylumen website and xpl hi say 7000 lumen…
So xpl hi and sst20 cw are putting out same output… i know xpl hi doesnt heat as quick as sst20… i like to know what are the advantages of xpl hi led in the rot66 ??
That would mean FF lumen specs are a little generous! $30 more for the xpl hi vs sst20. Maybe it's a brand thing and possibly not much difference except the price.
The advantages of using an XPL HI are higher output if the cells can put out enough power for these high VF LEDs. It may also have better tint on the CW model since it does not have a dome.
Otherwise, the SST20s are about as good as XPL HIs, as having a lower forward voltage than the XPL HIs, they can pull the same amount of power from fewer cells, resulting in even brightness with the XPL HI.
I have the impression they measured turn-on output with something like with very high drain Samsung 20S cells, having even lower resistance than Samsung 30Qs and VTC6s, and even VTC5A and VTC5D.
If it had 4 cells, I think it could probably achieve 10k lumens even from 30Qs.
TLDR: Fireflies was way too generous with the output of the light with XPL HIs.
Nice tech info thanks BSM.
Thanks BSM.
Yep, makes sense. 
The Samsung 20S seems to be known as the hardest hitting 18650 in the vaping community. 6-7 milli ohms or something? (if we are talking in a relative sense to VTC5A/5D ~ 9 milli ohms).
BTW do you know of any source for VTC6A?
I just compared it on the battery comparator, when this is newly charged and used in pocket rockets esp @ > 15A per cell for measurement purposes, wow. And the temperature increase @ 30A is really superb.