we just need confirmation of the O ring in the latest C01, but I have no plans to put mine under water anywayā¦
fwiw, here is a great listing of the Eight different LED options, based on the original hostā¦
C01 (single mode), C01S (two mode), and C01R (three mode)
(I added the ovals to the quoted image):
My order is showing āout for deliveryā today so when itās in Iāll post on the o ring seal issueā¦.
Yep, my tracking info also shows YANWEN. But it doesnāt look like itās the dead-slow Yanwen Economic Airmail, since the tracking number format is different.
So hopefully shipping time will be pretty reasonable!
My order just arrived:::
YES: there is an O ring seal around the LED
NO: The driver is not potted.
I measured 65mA draw from a charged eneloop.
Yay!
thank you for confirming
got a photo to share?
Alternative Amber, for those who dont do, or hire out, their own mods:
pic is a linkā¦ these use XP-E2 LEDs, like the first run C01R
Jesus,price is very high for a colored flashlight
No sense
lolā¦ a business that buys things from China, for resale in USA, has to triple the price, to make a profit
if you want to save money, mod your own C01R to Amber XP-E2 ā¦ the cost of the light, plus the cost of the LED will total about $15
I know,they quintuplicate minimum their effective cost.
Someone will buy them anywayā¦AM. first 
I dont recommend the C01 5mm Red, the beam is funky
wish I had a couple spare Yujis to swap in
I recommend the C01R instead, it has a better beam, and better modes
Thanks for sharing the comparison! Darn, I guess they werenāt able to improve it much beyond the prototype.
Guess Iāll have to figure out what to do with the two I already have on the way. Maybe sand the led to try and smooth it out, or put a diffuser on āem, and put āem on my ruck for night timeā¦ chemlight style.
For anybody who sands or scotchbrights the LED on their deep red C01, Iām sure Iām not the only person who would appreciate seeing a before and after photo.
I think this is only a cosmetic problem. Anyone better try if this beam works for him first before sanding the dome, which might reduce output in terms of lumens, but for sure reduce brightness. The newer rngwn āhigh powerā LEDs also have a slightly deformed spot, clearly visible at the white wall, but insignificant in the wilderness.
My stash of C01 just came in.
Uh-ooh, what is that white stuff?!
Well, some will like this a lot but not me who wants a host for other leds.
(To be viewed in 3D when crossing your eyes)
Hard solid potting! Great tough lights but not for modding. I guess I have a lot of lights to give away now 
Btw, I measured 7 lumen output, the beam is rather nice (not perfect but the Yuji version was not perfect either) and the tint is lovely (3300K, right on the BBL, 98CRI, R9=89)
I guess I will be begging for a host version after all, but Iām afraid all 5000 are done already 
Oh, sound wonderful for those searching for a LED cockroach :-D. And 7lm in 3400K is better than the Yuji with 6lm in 3200K I guess.
Since those are said to be not potted this is a bit strange but nice, so a real cockroach :-).
Crap.
Is it signed BLF C01?
Arrived yesterday - as you can see, no potting - bad luck djozz
Wow, Sofirn made it a lottery! 
I have a couple of orange ones too, will check.
The o-ring situationā¦
Hammering out de potting with a bolt on top of the led required a lot of force, but it worked. And the o-ring is a confirmative.
But also no o-ring! Well, glad I havenāt ordered them yet (10 were planned).
yes potted, yes O ring:
(I added the arrow and text)
Not Potted:
Does it have an O ring?