It smoothed out the beam, so it’s more even, and a little dimmer. To me, that’s not a bad thing when it comes to 670nm.
Please excuse the missing edges of the beams. I was using a piece of white poster board that wasn’t flat.
The hotspot is still a little overexposed.
These are 10 inches away from the board.
Mod on the left. Stock on the right.
Mod
Effect
Good result,thanks for share.
Does you have removed Led from host or you successful sanded already installed?
Also the cone seem sanded
Yes, I consider the very low output, 0.4 lumens per djozz (1.4 lumens on my meter), of the C01 670nm, to be weaker than I prefer.
I like the second mode on the C01R, which on my meter is 10 lumens, for red light therapy.
the eyesight study used 20 lumens 670nm red, I consider that more than necessary. imo 5 to 10 lumens of 660nm red is plenty bright enough for my application.
I put the light directly on my painful arthritis. For migraine the light is shined into the nose.
Barry said this is the last batch of C01
thanks for the photos
per djozz, the sanded LED is now 0.2 lumens (half as bright as before)
I did it installed. Just took some scotch-brite, a pair of ESD-15 curved tweezers, and ran it across the led. Every once and a while I would turn it on to check my progress. Same thing with the reflector.
I’ve been trying the C01R on my arthritis, but it hasn’t helped it. Maybe the cause is keeping it from working? To me, the C01 670nm is better as a reading light. I have one with my notebook cover for when I need to write something down.
A couple more C01 “potting” datapoints. I just received a green and an orange moments ago. The green is potted, the orange is not. They’re very nice; I’m very pleased with the purchase.
10 LM from the SST20 or XPE C01R?
There are difference betwin them on modes brightness?
Nice comparisons MascaratumB! Any suggestions on how to diffuse the hotspot?
just a few posts further up this same page
look for the pics of red beams
Oh oops, replied before reading subsequent posts 
Datapoints: received 2xblue, 2xbrown, all unpotted. The brown is a nice colour 
I also got another black, red and brown C01 (previously got a black and red). All are potted except the brown one, it is indeed a nice color!
I’ve got say, I’ve been using one of my new ones to read by every night before bed and it’s a really pleasant light for that purpose. Nice soft light, a relatively wide beam, lightweight and easy to hold for long periods of time. I bought them thinking I might give them to my children… I might have to buy more if I’m going to do that!
Did this mod, and its a great improvement. I got the LED too hot when soldering it in, and it flickers then goes out after a few minutes, but a great mod, thanks Djozz!
Once I get another of these LEDs in that I didn’t kill with heat, I’ll pot it with RTV and use it as my keychain light
I love my C01 and C01s lights. My question is - do any of you have an easy way to get that (*&(^& O=ring into that little hole? It took me about an hour to get them fastened to the four C01 lights I bought as give-aways. I couldn’t resist the $3.99 price. And as far as I am concerned, the $3 extra for faster shipping was worth the expense.
Just got mine. There’s one annoyance that the battery bore is a little too small and some oversized AAA batteries won’t fit in there.
I tried cramming a Tesco alkaline in there and it refused to go in. I ended up leaving a nasty scrape on the battery casing after the ordeal.
Buy another one. The bore holes vary quite a bit.
You mean the keyrings? I’m using pliers for the really small ones.
Ah I was actually going to try that. Was also going see how it would look with film on the reflector. Have to wait for the lights to arrive first.