[BLF special edition light] new Sofirn AAA twisty high CRI Yuji 5mm LED (CCT 3200K or 5600K) for 6.50 USD

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djozz
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polarweis wrote:
crap haha. If you temper it after the hardening it should be better. and tempering doesnt take away any of the hardness if im correct. It just realines the carbon atoms.

Will try Smile
Hondo
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Yes, quench hot and fast – you want a 100% transformation from austenite to martensite, and slow cooling will result in retained austenite or pearlite at room temperature. The tempering will lower the hardness, but if done right not below the properties of a proper spring. Not knowing the steel, I would try tempering at 500 – 600 degrees Farenheit, or perhaps as much as your oven can reach. Let it cool slowly after reaching full temperature. The structure will still be martensitic, but it will relax the carbon and iron matrix adding ductility, as in making it less brittle, which is your problem after the quench.

tastewar
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Holy crap! I came here for flashlights, dammit, not to learn about hardening/annealing/tempering steel!! Silly

Noctiluco
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djozz wrote:
I do not know how he knows, well, actually Sofirn folks tend to talk all the time about their new projects Smile But yes, there will be a C01 pro, but it may get a different name in the end. No idea if it will get a TIR optic or a reflector, but the led will very probably be SST-20 95CRI (4000K and/or 3000K), and there will be two or three simple modes (it being a twisty). I have not seen a design yet so I would not expect this light within the next few months.

Please, Sofirn, only Two modes, 10/15 % — 100 %. Smile

hank
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I managed to convince Sofirn that their clips are faulty, they admit that the heating process was wrong and they sent what is left of the batch back to the manufacturer for improvement.

Is that an assumption, that it was the heating process?

I think I recall someone suggested earlier that the sub-contractor’s sub-contractor had substituted the wrong metal to make the clips?

Sofirn needs to somehow extricate their company from the usual corner-cutting approach.

Sofirn needs to decide to work, as the saying goes, in the early years of a better nation — in which no party in the chain of supply is trusted without QA and QC being done routinely.

teacher
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Since a couple of people have been able to heat treat their clips (although still searching for the exact formula) …. it stands to reason it was the heat treat that was woefully lacking. Whether is was wrong or did not happen… who knows.

But from the look of djozz’s clip that was bent… it looks like heat the treat process was skipped altogether by the supplier.

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

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hank
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it stands to reason it was the heat treat that was woefully lacking.

My reasoning differs, I can’t rule out the possibility the sub-subcontractor supplied the wrong alloy.

You can heat treat any alloy and get some improvement, but you can’t get the desired results from every alloy.

If their subcontractor supplied the wrong metal then they’d get an unexpected result, and leave the metal in an unanticipated condition so another heat treatment cycle would give an unwanted result. It doesn’t appear easy to undo then redo heat treatment to get it right the second time, even starting with the right steel.

http://www.engineeringenotes.com/metallurgy/steel/heat-treatment-of-spri...

Quote:
Any metal, or alloy which can be hard drawn, or rolled to fairly high strength and retains sufficient ductility to form, may be used for springs, or any alloy which can be heat treated to high strength and good ductility before, or after forming may be used. For special spring properties such as good fatigue life, non­magnetic characteristics, resistance to corrosion, elevated temperatures and drift require special considerations.

No, I’m not a materials scientist, I’m just reading what I can find online. As with most tech stuff, I find that it’s far more complicated than I’d have thought.

jon_slider
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djozz wrote:

pocket clips are generic, further searching will find them cheaper than this (pic is a link):
iamlucky13
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djozz, have you received any updates on when the red and blue colored versions are expected to be available? Thanks in advance.

tastewar
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I’m going to go out on a limb and predict…

…Not in time for Christmas.

jon_slider
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there are 49 left in 3200k and 45 left in 5600k

I predict no red or blue until this Black batch sells out

teacher
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Quote:
Quote:
it stands to reason it was the heat treat that was woefully lacking.
My reasoning differs, I can’t rule out the possibility the sub-subcontractor supplied the wrong alloy.

You can heat treat any alloy and get some improvement, but you can’t get the desired results from every alloy.

Could very well be, either way the heat treat was:
  • 1not done at all
  • 2not done properly for the steel used
  • 3the steel was a wildcard (an unknown) from the supplier.

In case #3 there would be no way to heat treat it properly because the steel is not what it is supposed to be.
No matter which it was, a crappy clip was the result for some of the CO1’s.

As far as heat treating a second time or even a third. It can be done with no problem at all if the steel has not been super heated past it’s limit on the first heat treat & ‘burned’ the Carbon out of it. So… if you ‘miss it’ on the first go around, try again.

Tempering after heat treat is very important…. otherwise you just have a hard, brittle piece of steel. Facepalm

Heat treating is a science. There are standard formulas for known steels that give optimum results if followed.

If you’ve never heard of Paul Bos (Buck Knives) & are interested in heat treating, do some reading… he was & is a master at it.

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

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djozz
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I have no update about the coloured C01’s after it was announced for “early december” which obviously has passed already.

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Just received my first 2 of 4 and want to commend all parties for the hard work.
These would have remained an idea but for the passion of BLF leaders and a company like Sofirn who listens to and (more or less) delivers exactly what we want.

I’m really impressed with the quality. I’ll have to snag a couple more of these little gems for friends. I think mine will pull double duty as an EDC and a bug-out bag/emergency light.

Ozythemandias
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Got mine and I’m please, thanks goes out to everyone involved in making this happen

How about a limited run of (preferably Grade 5) titanium? I can’t be the only one wanting that

 

djozz
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Ozythemandias wrote:
Got mine and I’m please, thanks goes out to everyone involved in making this happen

How about a limited run of (preferably Grade 5) titanium? I can’t be the only one wanting that


You are actually the first to come up with that. Twisties in titanium tend to suffer from gritty threads, but I have a ITP i3 in titanium that works very well. Does Sofirn do titanium editions at all? What would be nice is if the “pro” edition is there, to have that one in titanium Smile
dealgrabber2002
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I was comparing the C01 and the E01 last night. I really wish the C01 has a more narrow degree LED to give it the throw like the E01.

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djozz wrote:
Ozythemandias wrote:
Got mine and I’m please, thanks goes out to everyone involved in making this happen

How about a limited run of (preferably Grade 5) titanium? I can’t be the only one wanting that


You are actually the first to come up with that. Twisties in titanium tend to suffer from gritty threads, but I have a ITP i3 in titanium that works very well. Does Sofirn do titanium editions at all? What would be nice is if the “pro” edition is there, to have that one in titanium Smile

Titanium body and a brass head Smile

buck91
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dealgrabber2002 wrote:
I was comparing the C01 and the E01 last night. I really wish the C01 has a more narrow degree LED to give it the throw like the E01.

How drastic is the difference? I think the E01 with the Nichia GS was a good balance with a nod towards throw making it useful for maneuvering. Is the C01 THAT much floodier? Hoping it will make a good emergency neck light or backup light for camping.

maukka
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dealgrabber2002 wrote:
I was comparing the C01 and the E01 last night. I really wish the C01 has a more narrow degree LED to give it the throw like the E01.

You should probably keep an eye on Clemence’s Jetbeam modded with an Optisolis/E21A if you want an ultra high CRI AAA light with some output/throw. Of course it will be much more expensive than the C01.

dealgrabber2002
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buck91 wrote:
dealgrabber2002 wrote:
I was comparing the C01 and the E01 last night. I really wish the C01 has a more narrow degree LED to give it the throw like the E01.

How drastic is the difference? I think the E01 with the Nichia GS was a good balance with a nod towards throw making it useful for maneuvering. Is the C01 THAT much floodier? Hoping it will make a good emergency neck light or backup light for camping.

C01 has no hotspot. To me, it’s like a zoomie on flood. If you want to use it as a tent light; it’s fine. But if you want to walk around or look for things; I find it harder than using the E01. Using indoor to walk around is fine as well because of reflections from walls.

I was thinking exactly what you’re thinking about neck light or camping light last night when comparing the 2 lights. I would put the E01 around my neck, not the C01.

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buck91 wrote:
dealgrabber2002 wrote:
I was comparing the C01 and the E01 last night. I really wish the C01 has a more narrow degree LED to give it the throw like the E01.

How drastic is the difference? I think the E01 with the Nichia GS was a good balance with a nod towards throw making it useful for maneuvering. Is the C01 THAT much floodier? Hoping it will make a good emergency neck light or backup light for camping.

Very different. The Yujis at 25mA are great for navigating around the house at night, in my opinion. It’s bright enough to use at close ranges without dark adapted eyes, but not so bright as to be obnoxious if you have dark adapted eyes, especially the 3200K version. The floody beam extends into your peripheral vision, so you can have good awareness of what’s around you. That means necessarily that it doesn’t throw like the E01.

Outdoors, I think it’s reasonable for walking with dark adapted eyes, but you won’t be seeing very many paces ahead with it. It should be great around the campsite, but if you were using it as a backup on the trail, you’d want to walk slowly.

Your mileage may vary, of course. There is a lot of variation in what light level is comfortable to different people.

teacher
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Why did they use the wider beam in the CO1 instead of the more narrow beam?

If this has been discussed I missed it.

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

 .................................. "Slow is Smooth, Smooth is Fast" ...................................

       Texas Lumens Flashlights / M4D M4X Deals : sign up - save $$$$  

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defloyd77
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teacher wrote:
Why did they use the wider beam in the CO1 instead of the more narrow beam?

If this has been discussed I missed it.

If I remember correctly, Sofirn goofed up and ordered the 60° Yujis instead of a narrower one.

dealgrabber2002
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It would have been the perfect light for me had they use a narrower one.

teacher
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defloyd77 wrote:
teacher wrote:
Why did they use the wider beam in the CO1 instead of the more narrow beam?

If this has been discussed I missed it.

If I remember correctly, Sofirn goofed up and ordered the 60° Yujis instead of a narrower one.
Ouch…. Facepalm

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

 .................................. "Slow is Smooth, Smooth is Fast" ...................................

       Texas Lumens Flashlights / M4D M4X Deals : sign up - save $$$$  

         Rudeness Level _ mΩ _ {width:70%} _ LightWiki _ LED Tint Chart  

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Random Dan
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teacher wrote:
defloyd77 wrote:
teacher wrote:
Why did they use the wider beam in the CO1 instead of the more narrow beam?

If this has been discussed I missed it.

If I remember correctly, Sofirn goofed up and ordered the 60° Yujis instead of a narrower one.
Ouch…. Facepalm

The 60 were supposedly the only ones available
jon_slider
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Yes Sofirn is using 60 degree Yuji’s

djozz wrote:
Before I got these samples I was concerned by the wide 60 degrees leds but now I like that nice even floody beam, it is really pleasant and nothing like the ugly Fenix E01 beam.

fwiw, the McGizmo Sapphire also offers a 60 degree Yuji.. we are in good company Wink

The E01 beam is not to my liking at all, plus the tint sucks, and it has terrible CRI

the C01 beam is MUCH nicer in every way

Gunga
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I’d buy a titanium or titanium / brass one.

wolfstyle
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Titanium/ Copper would be good.

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