got my lights today. works great but im having a very hard time to attach the mettalic keychain to the light 
wish they did this from the factory…. so far no luck…… maybe imstupid….
ah i got it too work after a bit of patience 
time to retire my astrolux a01 light now… so will have the sofirn and the olight uv keylight fun combo. Really great sofirn looks good on turbo.
News Flash:
C01R stock is slowly running out. I'm not sure if that means including or excluding the stock they want to sell via Amazon DE/US. However, there might be a chance for a second batch of C01R. Now, Barry and I have been thinking whether Sofirn should use XP-E2 photo red again or move on to SST20-DR. I said it's probably worth trying the latter one as the optic seems to fit really nice to the die/dome size of SST20 emitters, see the beam quality of C01S using SST20 4.000K 95CRI. Eventually, chances look not too bad that we may see less artifacts in the hotspot by using the slightly bigger LED. Moreover, they could try to push C01R even a bit more to its very limits - in both directions. That means more power (and heat for sure :-D ) on high mode but also less power and less brightness in the low mode for even better preservation of your night vision. We could name it C01R reloaded or C01R V2...whatever.
Sofirn is also looking for alternative TIR lenses (as an accessory for instance) to enable each customer choosing his/her favorite beam profile. As many of you stated, a floody wide angle beam lens would be the icing of the cake.
10440? :sunglasses:
They need to tool up for some other metals!
Got them. They are perfectly acceptable on low. Still going to put a 45 degree optic on it to make it dimmer. It really is hard to judge monochromatic lights based on pictures or numbers.
If we have a chance for a lower low and a higher high…any chance we could get far red (720 nm)? 
A far red LED would not be able to make a useful amount of light. Probably 1 lumen or less.
SST-10-FR is 730nm. Human eye is about 117x less sensitive to 730nm compared to 660nm. Not sure what LEDs are available at 720nm, but eye sensitivity isn’t much better at 720nm compared to 730nm.
I‘m just checking with Sofirn if it’s feasible, reasonable and cost-effective to revive C01 using a 5mm EPIGAP EOLD-670-524 LED with 670nm.
https://www.epigap-optronic.de/tl_files/frontend/epigap/Datenblaetter/LED%20VIS/EOLD-670-524.pdf
However, costs could be insane for a small batch of these lights. Maybe I should contact them to get a quotation. :-D
No way, sorry.
I could imagine they have a plan like this in the drawer but materials like copper, titanium or brass are rather expensive and require different tools for machining. I wouldn‘t mind to see a nice C01S in mokume gane for $ 80.00 :-D
I made some suggestions to Sofirn to lower the low mode for better preservation of the night vision and to reduce brightness on medium mode as Djozz mentioned before as it is too close to high mode. I also suggested trying to raise the current on high mode a bit more as SST20-DR can sustain higher currents than XP-E2 photo red. Not too much of course for a small light like C01R but maybe it’s worth trying. ;-)
Far Red is probably not worth it as most people will barely see any light coming out of the front. I suppose the reasonable limit is 690nm (for medical/scientific purposes like here https://budgetlightforum.com/t/-/62550).
I’m in for longer wavelengths if price is right. Else I would say a different optics and a lower low would be a huge step forward. But bear in mind that the floody option significantly reduces brightness already. We’re not talking about low reduced by a magnitude.
Concerning longer wavelengths:
IMHO, it's quite a risk for a manufacturer to start a series production of these exotic flashlights, even if their MPQ is 250 pcs only. The smaller the MPQ is, the higher costs per unit eventually get, which again leads to less margin in selling for a reasonable price to the customer. If we now pursue to get a C01R with 730nm, chances are big that many customers will feel screwed after buying and using the light as there's barely any light to see even on high mode. A light like this could be useful for medical or scientific purposes for sure but that's a whole different category. I have no reliable, scientifically proven source right now but word of mouth is that high radiation not only of short wavelengths (x-ray, UV-C, UV-B, UV-A and even blue light) but also of long wavelengths (far red - infrared) can be harmful to the human eye.
Concerning some tweaks in C01R:
I didn't want Sofirn to reduce brightness settings by a magnitude but some gentle reductions to improve mode spacing. A lower low might end up in a great firefly mode using the "honeycomb" optic or anything more frosty/hazy/milky...whatever. :-)
Marginally scientific low runtime test:
Freshly charged ~10 year old Eneloop AAA: 55h 10m
Shutoff voltage: unmeasured
Freshly charged ~2 year old Amazon “750mAh” rechargeable AAA: 57h 0m
Shutoff voltage: 0.835V
Anybody else in the US still waiting for their light to emerge from the e-commerce black hole that is Newgistics?
Gave up on receiving mine. The post office does not deliver to homes up here in the mountains, only to PO Boxes. So I always put both addresses since UPS and FedEx bring to houses. But companies change things. First they did not include the PO Box and Lin contacted me. I gave her the PO Box and they tried again, but that was undeliverable too for some reason. So no go. Other things were delivered to me from them and other companies. Life in the country is so good I do not mind an occasional glitch.
I’ve been abroad with work and only just got my hands on my C01R.
Light output is great, the wavelength is noticibly deeper than other red leds I’ve got, when ceiling bounced on high, the colour reminds me of film scenes in submarines or photo dark rooms.
Re. Brightness, yes the low could be tad lower but it’s not a deal breaker for me.
I ordered the hard plastic AAA diffuser at the same time as the C01R, on medium or high this will make a great 360 degree light to clip onto a backpack when cycling.
Just got mine. Love it but hotspot is kinda anoying so i took a piece of Scotchbrite and “polished” lens a bit. Result is amazing, beam is uniform without hotspot and artifacts.
The holdup for mine has definitely been Newgistics. My light was finally handed off to the post office yesterday, and is out for delivery today. It only took a week or so for it to get to the US. Newgistics and their “shipping partner” had it for over a month! I’m hoping that yours is just in the same situation, and will get to you soon.
12000 km in 60 days, 200 km per day, still faster than walking or swimming from China 
So set on medium, held at elbow length so it illuminates both eyes, viewed for three minutes through closed eyes.
I think that’s roughly the prescription. Time wll tell if my vision improves.