I tried to talk Barry into a brass version of the C01S a year ago, with extra deep knurling, I tried really hard but as I understood from him, Sofirn’s machinists were not equipped for brass machining. So while it seems routine for Lumintop, Mateminco and Olight among others to bring out copper/brass/titanium versions of their lights, that seems not so for Sofirn. I have not seen Sofirn lights in other than aluminium sofar.
They just launched their first keychain flashlight (SC01) made of stainless steel. Maybe it’s not only a matter of skills and machining but also a matter of their business strategy. Brass, copper and titanium are much more expensive materials that would eventually raise sales prices way above their usual (aluminum lights) prices. Expensive flashlights however could be leveraged by introducing a premium line next to their budget line utilizing expensive raw materials and more complex/more efficient (buck/boost) drivers.
I bought mine from FastTech, https://www.fasttech.com/p/4113703 (not sure how good they are, though).
They’re strong enough to technically hold the light at 90 degrees, but if the surface is smooth then the light will start sliding with a light tap.
And here’s the second mod that was needed, 10 minutes with a common solder iron, this is the easiest host ever.
The led is the bit higher current-capable RWN05-32K-C-EX from rngwn (see link), I measured 3007K, 97.2CRI, R9 97 and duv –0.0034 for this particular led ( , how nice can a tint get?)
The 220 resistor was replaced by a solder blob, the battery current went up to 135mA and the output was better than I thought: 25 lumen on a alkaline and 21 lumen on a old crappy NiMh. A major brightness update over the 7 lumen stock.
About the beam of the mod above. The RWN05-32K-C-EX led has slight tint unevenness over the beam, but what is more obvious is a ringy “hotspot” caused by the reflecting aluminium of the C01. I may lightly sand the led itself at some point to make the tint more even, but the hotspot was smoothed out very effectively by circular sanding the reflector with 180 grit sandpaper. The appearance of the reflector did not change much, but the beam did.
Left sanded, right stock.
I doubt that (but I do not have one to check), the bad beam of the red C01 seems to me not caused by the reflector. I think it is because the light emitting area of the red led is much smaller than a white led because it has no wide phosfor layer. And small light sources need carefully manufactured optics to make a good beam, the top surface of a cheap chinese 5mm led is likely far from optical quality, or even 5mm Nichia leds.
Measured up to 7.5 hours now, time to go to bed. Will have another look tomorrow if there is still light, I assume that just as the unmodded C01 it will drain the battery to completely empty. The runtime chart sofar:
Yes, no regulation, I already noticed that without resistor it does not light, it is simply is series with the led somewhere I guess (before or after boosting?, no idea how that works really).
I’m not fanatic in constant output, a steady decline is useful, like the incan days, there is not so much that demands steady brightness and a slowly fading light does not leave you with surprises.