I’ve had a non-anodized (raw) C01S since May 2019 and it’s actually still looking pretty nice. Granted, I take pretty good care of my lights. But I have been carrying it in my shorts every evening for the past nearly 2 years, using it daily. I really like the no-nonsense 2 mode driver and I’ve outfitted it with a trit and magnet.
It is not the quality of those TIRs someone found in Bulgaria (artifacts at the white wall), but you’ll see no artifacts in real situations. Much, much better than the original optics with its rings. Can recommend them.
It’s very little threadlock. Sofirn just made sure the pill won’t stuck in the battery tube when loosen the head. This problem has been reported a few times.
For outdoor, maybe the original optics will do. It gives a lot of throw. I recommend using a 219C at 4000K, that gives a nice beam and a larger hotspot. This is my only C01S still with original optics.
Thought the Led die size on TIR lens had no effect for the hotspot width. Good to know it does
Also,maybe in real there is small difference betwin frosted 25° and 45 ° lens
No more rings, but although I don't have a way to measure it, I notice a noticeable decrease in brightness WRT the original optic, both in direct lighting and in a ceiling bounce test.
A piece of DC film on the original optic gives as good a result on the beam, without any noticeable brightness loss.
Strangely I had not noticed such a dimming effect on the E3A with the Yajiamei optic, but maybe I did not compare both options carefully enough.