Dont you have the TN42 V2? I remember your posts about the Proprietary battery issue.
The specs on this light are basically the same.Only advantage is the 21700. I considered this light but makes no sense to me to get basically a duplicate with more run time.
Mine is a TN42vn CFT90. NW 5095L/1.05Mcd At turn on.
lol, if color doesn’t matter to you then there will be plenty of black. I have seen like a 10:1 ratio of people wanting silver vs black. I figured silver would be popular but didn’t expect this much.
This light will be better 
and you can sell that tn42. It was just too expensive for me to pull the trigger on, even at 30% off. This light (WT90) is a steal ! That would be my reason honestly.
Didn't realize how close the TN42 is in size. Taking 4 21700's as listed here, I would think the tube would be a bit wide but it seems to match the tube width of the WT90.
It's lighter in weight but not much in heat mgt finning. Factory rated throw at 864 kcd, but rated 1.2 Mcd at 2 seconds by Vin, interesting but yes, pricey..
I'd have to measure the proto at 2 secs. My tests were done at least 20-30 secs.
TomE, off topic a bit but I wanted to know, do you still have your old XML2 dedomed TN31? Could you measure it with your newest methods / luxmeter? Curious how this stacks up here.
Good Q. Funny, I did a few TN31 mods but never bought one (same for the Shocker), but the brothers Rick and Rodney gave me one, so I do have it, modded, but not sure fully modded but is dedomed. Pretty sure it's working, think tried it recently -- Ohh, I remember now it never performed well in throw. The TN31 had quality issues with the reflectors - some did really well, some not so well, so think'n this was an under performer.
After dedoming, typically lumens is 1500-1700 or so, and throw in the 500's I think. Much smaller reflector than this one, so can't compare with the throw #'s, but the old XM-L'2s could work on high amps, and the TN31 modding got very good amps - that driver was luckily over-built for that light as stock.
Actually the old BOSS1 has a similar reflector size, with 4 parallel 26650's it could compete with this light if modded with a SBT90.2. Think I looked at it but not sure now why I decided against the SBT90.2 for it. I also have a UCLp lens in the BOSS1, but the light itself is sort of ugly, crude, and awkward.
The production WT90 will have an AR coated lens so we could see up to a 5% bump in lumens and kcd, but all depends how bad the proto lens is and how good the production AR lens is.
Pretty sure the lens in the prototype is the same as the production version, just minus the coatings as they were not ready yet. They said they sourced some higher end lenses, they didn’t want the cheapest option.
Off topic comparison!
I have a OSTS TN31mb
Certified at 800L/ 470Kcd with XPG2 S2 bin.
Impressive.Almost 8 years old. 
Yeah, LED tech has kinda peaked at this point, from here on I don’t expect any large gains, mostly just quality improvements and better tint etc.
Pretty sure OSTS didn't do any amp boosting on those TN31mb's either - he did some amaz'n work. He (saabluster) used to post here - he might have been the one that talked about the reflector variations.
Sorry for pulling this off topic. The TN31 is the biggest thrower I have and similar in reflector size to the K1 (65mm and 62mm respectively). I used to ‘only’ see 345kcd from an XML2 dedomed running ~9A. Now I have a PM1 @ 7.0A hitting 575kcd. The OSTS numbers sound believable, but I can’t believe an XML2 ever cracked into the 500s with this size reflector.
And I would be shocked if the tn42 v2 handled heat better than the WT90, and Narsil. There’s too many reasons to buy the WT90, And I was about to buy the tn42 v2, then I saw this GB drop. Haven’t looked back, I don’t see a compelling reason to spend an extra $50 on the tn42 when it’s on sale. Batteries included, sure, but I’ll use my 40t or molicel anyway
Hhmm, maybe I'm not remembering clearly, but:
Here 495 kcd at 6.5 amps
Here's a couple in the list, close to 500 kcd. I just recall rdrfronty, or ILIKEFLASHLIGHTS seeing/testing over 500 kcd for a TN31vn and I was frustrated I couldn't match that. I think rdrfronty re-tested against mine and found he initially tested high and dropped it lower in his lists and postings.
We talk'n some classic BLF modding history here... 
Those modded TN31's got pretty hot even at relatively low amps - there were like no fins and very thin around the hot zone by the LED.
OK - think I thought the high mark was 600 kcd, and most of us were in the 500's, but I was off by a 100 kcd: 500 kcd was the high mark, and 400's was typical.
300's? Not sure but could be an issue with the LED, dedoming process, basic light like the reflector, etc. or maybe over amped. I modded one that I found kapton tape on the bottom of the MCPCB! Factory mistake, leaving a heat barrier in one of the most critical spots of all - mine wasn't the only one reported like that.
Yes. I look back to these early days and really get nostalgic. Maybe its the green grass kinda thing, but I miss the days when most of us didn’t feel like we knew all that much and everything was a new discovery and collaborative. Everything got modded and craftsmanship was all around us. The same happens now I guess but it all just feels so business-y these days.
Last thought on my OSTS TN31mb XPG2 S2 or S3…cant remember.
The only.negative is the pencil beam.Works well in fog and on water looking for buoys.
This version Never gets hot.Been using the same NCR18650A batteries for 7 plus years! It does not get used as much. The batteries are amazing.Never below 4.15V even after resting a month.
Measured at 470Kcd.Personally I think it is more.I shed light on a tower from 1 mile.May not be ANSI…Still impressive.
If WT90 came out 2 years ago I certainly would have gotten it.I paid way TOO much for TN42vn 90.Originally it was $600 about 18 months later dropped down to $400. 
So I owned a OSTS TN31mb. Didn’t keep it long, the low amount of lumens, along with the pencil beam didn’t make it a very versatile light.
Before my modding days, Tom did a TN31 for me. With the XML2 it did somewhere around 450kcd. Later, I went back through it and added a fully dedomed SST40 (one of the few successful complete dedomes I’ve done). That got me to around 497 kcd, and 2000 lumens.
These days, I’m willing to give up some throw for more lumens. This WT90 seems to provide the best of both worlds!
TA I’ll commit to a black model please, and sorry about the thread de-rail.
lol, no worries off-topic conversations can be interesting if nothing else is going on at the time.
I’m itching for this light. I know we got over a week at least, but I just needed to say it. I’m ready. Lol
I already ordered 3 40t batteries
I saw Djozz ordered these
Are these any good?