In regards to Duv “Green” is only really noticeable around 3500K-4000K and higher temps
In warmer temps <3500K higher Duv begins to look more yellow than green
If you look at the below chart you can see. BBL refers to the black line in this chart. So the “rosy” color people like is mostly noticeable in that 3000-5000K spectrum but higher and lower than that and other hues may be more present.
well done
You think guys these from Sofirn are the same Bin Chromaticy of Digy-key tested Leds or you find difference at low current?
So you got SST-20 4000K from Intl-Outdoor in February? I asked Hank if it was FA3 bin, but didn’t get a reply.
Yes.
I have asked Barry before about a brass C01S (although I suggested extra deep knurling instead of smooth), and he answered that brass was not something that Sofirn could do. But things may change over time 
contactcr said:
“In warmer temps <3500K higher Duv begins to look more yellow than green”
good point
hard to see a big difference in tint at incandescent cct
it still helps when you offer duv numbers to compare sliced and unsliced
pic originally by contactcr, is a link to his
LH351D 2700K 90CRI thread:
shaved = orange sunset instead of lemon sunset? lol
the tint difference above and below the bbl, at 2700k, looks quite small
Stupid questions, but:
a) has anybody tried to use the driver of these C01S flashlights with 2xAAA cells?
b) what is the worst that can happen if I try to use the driver with the 2xAAA ? Fry it?
:cry: :confounded: :weary: :person_facepalming:
from most to least likely
driver melts and dies, and cannot be fixed
LED poof!
creates a short that ignites the batteries
and you cant find the fire extinguisher
there are no stupid questions, only stupid answers
Ahah, that’s what I thought 
Flashlight meltdown, at the end
I am just asking because I saw this post the use with 10440s (for a short amount of time). Knowing that:
a) this should be a 1.2-1.5V driver
b) it didn’t go completely “boom” when some people used it with a 10440 Li-Ion 3.7V
c) that 2xAAA will be at most 3.0V
I was trying to perceive wether I could/should move this driver to other host I have that takes 2xAAA, therefore - hipothetically - increasing runtimes (well, if it didn’t go “boom” throughout the way)…
I’ll see what to do meanwhile! :+1:
AFAIK having AAA in a 2S configuration will probably only result in all mode being brighter and not extra runtime as it is a boost driver.
I could be completely wrong though.
Hum, if that is the case, my point wouldn’t be totally missed out, but it would things less funny, as I do appreciate the lower “low” mode… :person_facepalming:
I just did a quick little test 1S vs 2S on two of my C01S lights.
The high mode is the same brightness on both 1x AAA and 2x AAA (within margin of error on my crude test setup).
The low mode on the other hand is more than 4 times as bright on 2 vs 1 AAA.
Thanks for your input on this Noir! Well, I guess it won’t worth the trouble trying to change the driver from one light to the other…
I’ll keep it as it is, both of them!
Thanks again :+1:
So anyone have ideas if sofirn will make a C01S with middle mode? I’m really interested in this light. The only thing stopping me is there are only low and high. I’ll buy a few if they add middle mode too. Nite useful for me.
Apart from flashlights that have adjustable user interfaces (like biscotti) normally that kind of wishes are a bit futile because there is no user interface that will satisfy all and a manufacturer simply chooses one that seems popular enough, in this case 2 modes, and that is the end of it. But by chance, Lux-Perpetua and Sofirn are working on a red version of the C01S that will have a 3-mode interface (even with 2 mode groups, low-to-high and high-to-low), so the driver is already there. Perhaps you can request Sofirn to make normal versions of the C01S with that driver, or you may be able to swap the led of one from red to white?
I’m not well versed in led swapping.
Where do usually people request for this kind of stuff? Any thread that people use here that sofirn regularly read? As sofirn do listen to customer sometime, at least compared to other manufacturer.
There’s a thread I originally set up with the intention to focus essential communication between BLF and Sofirn.
The general Sofirn development thread
Everyone is encouraged to post his/her ideas, suggestions, questions regarding Sofirn flashlights there. I know that Barry (Sofirn) is reading our input from time to time and appreciates our thoughts. Some of BLF’s ideas were already incorporated in final products.
Concerning C01S in particular, the odds are not too bad that the C01R UI (2 mode groups with 3 brightness levels) could also be incorporated in future batches of C01S. I have been talking to Barry about this topic already but changes like these require the right proportion between costs and benefits (= enough demand by customers). The new driver as in C01R is slightly more expensive.
I am not sure if the driver of C01R, programmed to work efficiently with a low forward voltage XP-E2 photo red emitter, will work properly with an SST-20 LED.
I have both the C01 and the C01S, and like them both. I’m not sure I would go for a three mode C01S. If I want three modes I have several Tool AA 2.0s that I can use that aren’t all that much larger. Granted, it’s not likely that anyone would put a Tool on a key chain, but since I don’t own one of those (keychain that is) it’s a moot point with me.
For me, whichever way this process goes, it has to be high CRI. That is the kicker for me. Since my first High CRI light I have been hooked, and have bought nothing else since then. I am perfectly willing to accept the slight lumen drop to get the much greater color rendition.
Also, I just want to thank you Lux-Perpetua for all your efforts and assistance here, and thank Sofirn for being open to working with us to provide these wonderful small lights.
I’d like have switch tail version of this light,still 1xAAA but 3 modes(no strobe/sos) and support for both types battery.Short total lenght
A switch tail would certainly increase the length of C01S. I am afraid that a tailclicky version would require a new driver or at least some firmware changes (clicks instead turns). The same would possibly apply to the 10440 (3.6V) battery support. This would require Sofirn to develop a complex boost/buck driver for both battery types. The sales margin of this little keychain light is not very high, so it takes a considerable volume of sold units to be profitable.
I am not aware of Sofirn‘s sales strategy for C01S but I could imagine that they will try to use as much common parts as possible for future variations of this light, i.e. same driver architecture, same host design, same UI, a universal manual for all variations, etc..
With the new driver of C01R (for emitters with low Vf) maybe there’s a chance that Sofirn will try testing Osram‘s CSLNM1.TG (a.k.a. „White Flat“) or LG‘s LEUVA33W70RL00 365nm UV LED in this host. However, it would require to use different lenses/optics and I don’t know if it’s worth the effort, see reasons above.