When I received mines (from Sofirn site), I tested an orange one (which doesn’t seem to be potted).
Threw it up to the air in my room for 2 or 3 times, let it fall on the floor and…still works 
It just got 2 small bruises in the head 
Love C01 but not the Red Led version.
Irregular beam with artefacts
Led is not centered,maybe miss Oring
Thanks for the video djozz!
Very convincing durable little puppies, and the aaa lights are too! (-;
No!
O ring should center it, Led a bit crooked and can see space
can’t diassemble now it’s potted.
But classic C01 is wonderfull
Yes, it is.
People devised methods to get the 670nm C01 more floody with a more even spot. Maybe this is something for you.
I tried various grades of sanding on one, and the beam really improves but think I loose a lot of light. I should have measured the output before/after so I can not be sure, but compared to my second red C01 it has 30% less output
That’s to be expected. Are you sure that it is really the total output and not just only throw? And lower output doesn’t sound bad for a red light that is intended to be used in low light conditions.
How many lumens does your C01 Red produce, in stock form? I would like to crosscheck my meter with yours…
on my meter it only makes 1.2 lumens
I consider the C01 Red pretty useless, except as a spare battery carrier
imo sanding the LED dome will not make the light more useful, just dimmer
how about potting the whole “cone” where the led is with clear acrylic, kinda turns the whole thing into a big TIR lens and shouldn`t lose any light, if it remains the same (and it shouldn`t be) doing scotch tape over the front would now be possible.
Potting the front with clear acrylic will remove the lens function of the front curvature of the 5mm led, it will turn the light in a sort of mule, but with a weird reflector effect. Could be a nice beam by chance though.
I measured both red C01’s properly, and it is worse: the untreated one I measure 0.45 lumen, the one that I sanded the reflector and led of I measure 0.21 lumen. But it is not guaranteed that before the sanding operation both lights had the same output so it is kind of a bad experiment :person_facepalming:
About measurement cross-checks: this is about the worst way thinkable to check light measurement contraptions. First we do not have an idea how much variation there is between output of different red C01’s, could be a lot. Second, the region of the spectrum that I found luxmeters to have the highest errors is in far red, usually they read multiple times too high in far red (as also seems the case with your luxmeter), even if the performance over the middle part of the spectrum is very reasonable.
thanks!
you probably used a different conversion factor than for white light
in any case, very helpful
I find the C01 Red rather dim, and the beam is poor. Sanding the LED makes the output lower, and the beam is still not very good…
I prefer the C01R… it has a lower minimum, plus two higher modes, and a very nice beam
No. I have seen the spectral sensitivity curve of my luxmeter (a Mobilux class A meter) and it is extremely accurate even at the flanks of the visible spectrum. So I can use the same conversion factor for all sources of visible light.
ok, good to know your numbers are solid for both red and white, with the same conversion factor
my output value for the C01 Sophia is 6.6 lumens
I think that approximately matches yours for the C01 Sophia
so since my red reading of 1.4 lumens for the C01 red is 3.5x higher than your reading of 0.4 lumens, I think you are correct 
very helpful
Does change resistor will incerasse output of Red C01?
Yes, if you change the 220 (22 Ohm) resistor for a lower value, the output increases, you can even bypass it for the highest output.
So C01 and C01 Red Led have same driver?
I mind to swap the Red Led with the rngwn’ 5mm white
I may be showing my ignorance here, but why would the driver be different? I see the driver having two functions: Boost or buck the source voltage to the correct voltage for the LED, and, in the case of a multi-mode light, make the appropriate supply changes to the LED for the mode selected.
Does the 670nm led have a different forward voltage than the others?
It does have a significant different forward voltage, under 2V, while white leds are over 3V. But still I expect the same driver, but maybe the resistor limiting the current has a different value.
Swapping the red led however requires removing the potting, I read that it is possible but personally I have not attempted that.