[Pre-Order/Shipping mid of June] Sofirn C01R - XP-E2 deep red AAA keychain flashlight

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lightdecay
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Is the issue only affecting XP-E2 Photo Red 660nm, or is XP-E2 Red 625nm also affected?

RVDWB5
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Interested in 2x deep red please Smile

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lightdecay wrote:
Is the issue only affecting XP-E2 Photo Red 660nm, or is XP-E2 Red 625nm also affected?

They both are very low voltage.
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amishbill wrote:
Ok, so THIS is the point where the C01R idea officially mutates from a simple "give us a small run with a different LED and a colored body" into "please rework an existing production template and build something special just for our small run - please?" In layman's terms, what exactly do we loose if they give us a red LED on a standard L/H C01 driver?

If I understood everything correctly, the C01S driver "as is" will not be able to handle the low Vf of XP-E2 deep red at low currents (= moonlight or low). Eventually, we would only have a high mode here without doing some tweaks on the circuitry. Consequently, they look for a solution that can be deployed without changing the entire driver design. I hope I get some detailed news soon but for the time being Sofirn told me they will find a way to make their driver work with XP-E2 deep red.

“Everyone, deep in their hearts, is waiting for the end of the world to come.” (Haruki Murakami, 1Q84)

samyy
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And what about to try different LED?

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samyy wrote:
And what about to try different LED?

It will be hard to find another comparable LED with "better" specs in terms of the LED's forward voltage (Vf). They may try Samsung's LH351H or Luminus' SST-10R but I doubt these will be much different to Cree's XP-E2 deep red. Furthermore, it's challenging for Sofirn to source less frequently demanded LEDs as they have contracts with certain suppliers who cannot supply every LED we deem to fit into the C01R. Sad Provided that there was enough demand for further color-LED versions, e.g. with XP-E2 blue, green, amber, ..., it could be worthwhile to develop a separate driver. But for now, I hope they can surprise us soon with an alternative idea.

“Everyone, deep in their hearts, is waiting for the end of the world to come.” (Haruki Murakami, 1Q84)

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Lux-Perpetua wrote:
… But for now, I hope they can surprise us soon with an alternative idea.

I once received and fiddled with a C8S Sofirn buck driver (sense voltage: Facepalm ≈0.23V), it worked but as usually happens with very high sense voltage drivers can't really say great things of it from a modder's viewpoint, imho burns too much power in the sense resistor and this means lesser efficiency and small room for overcurrent purposes.

What where the Sofirn managers thinking when planning the C01S? They probably cheapened to the brim in the driver for maximum cost savings, and the price paid is lack. It strictly is a boost driver, blows up with li-ion cells (no multi-chemistry). Its sense voltage, at ≈95mV, could be better, and also detrimentally contributes to a high minimum Vin to Vout difference.

Well, hope they can do some optimization to the driver for it to end up working. I wouldn't really mind if it means the low mode ends up being slightly more bright than it should, just slightly of course. Hope they also rework the current sense thing to reduce the  Vin to Vout difference, and as a side effect we get improved driving current for red emitters. 

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Lux-Perpetua wrote:
samyy wrote:
And what about to try different LED?

It will be hard to find another comparable LED with “better” specs in terms of the LED’s forward voltage (Vf).

The color E17A is a 3V LED due to being phosphor converted from blue.

However, it probably won’t appear as deep of a shade of red as a photo red, nor be as efficient as standard red.

Additionally, it was already mentioned Nichia’s can be hard to source in small to medium quantities, and as reported by Clemence, these chip scale packages are more difficult to solder to a board. Perhaps they could buy enough from Clemence, but almost certainly at a higher price than buying straight from a distributor, especially if Sofirn normally has their LED’s flowed onto PCB’s by a shop with pick and place equipment and other aids.

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Id buy 1 or 2

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Barkuti wrote:

[...]

Well, hope they can do some optimization to the driver for it to end up working. I wouldn't really mind if it means the low mode ends up being slightly more bright than it should, just slightly of course. Hope they also rework the current sense thing to reduce the  Vin to Vout difference, and as a side effect we get improved driving current for red emitters. 

Sofirn told me a prototype will be ready soon. According to their engineering dept. they will not be able to reach 470mA but they will try to get as close as possible.

“Everyone, deep in their hearts, is waiting for the end of the world to come.” (Haruki Murakami, 1Q84)

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Grrreat Lux-Perpetua, looks like they are going to make it work. They won't be able to get to ≈470mA? I think that means they could fit an R22 for ≈430mA. So, there will be improvement. Thumbs Up 

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Please remove my entries from the interest list.

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oweban wrote:
Please remove my entries from the interest list.

Okay, I have deleted you from the interest list.

“Everyone, deep in their hearts, is waiting for the end of the world to come.” (Haruki Murakami, 1Q84)

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Put me down for two, please (deep red). Thanks!

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Hey, just bumping this but also I was curious if there is any news as to what comes next now the numbers are met?
Cheers!

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Propeak wrote:
Hey, just bumping this but also I was curious if there is any news as to what comes next now the numbers are met? Cheers!

Currently, Sofirn‘s engineering is working on a prototype, maybe even a whole new driver. Once that has happened I plan to discuss the result of the UI poll with them to see if we keep on using the „high-low“ UI or move on to a more advanced UI (at higher costs). Eventually, Sofirn is going to launch the manufacturing process. Maybe they will only offer deep red or both red and deep red, depending on their sales forecast and supply in components. 

I don’t have any confirmed updates yet but I‘ll keep you updated.

“Everyone, deep in their hearts, is waiting for the end of the world to come.” (Haruki Murakami, 1Q84)

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Thanks so much for the update and the whole project Lux, sounds pretty good! I think this is going to be a really unique little light ideal for so many tasks.

My lack of knowledge will really show here, but here goes: is the deep red just less bright or am I missing something? Are there any beam shots of these two leds? I don’t care so much which are used AFAIK but I’m just curious.

Many thanks once again for all the hard work and the great idea!

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hank
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I am interested in the C01R (XP-E2 red or XP-E2 deep red)

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I would be interested in further color-LED versions, e.g. with XP-E2 blue, green, amber

I have my original Arc AAAs made with 5mm LEDs, in red-orange, cyan, blue, and “snow white” — I never collected the full range of colors.

Amber would be especially useful for nighttime use without interfering with sleep.

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hank wrote:

Amber would be especially useful for nighttime use without interfering with sleep.

According to the datasheet Amber emitters drop in output with increased temperature in a very steep way, i.e. their output at 85°C is just ⅓ of what they do at 25°C. 

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So far, I do not have any updates yet. There are some delays right now as Sofirn is currently involved into many projects at the same time.

hank wrote:
I would be interested in further color-LED versions, e.g. with XP-E2 blue, green, amber I have my original Arc AAAs made with 5mm LEDs, in red-orange, cyan, blue, and "snow white" -- I never collected the full range of colors. Amber would be especially useful for nighttime use without interfering with sleep.

I hope Sofirn is working on a driver tweak that can be used for more low-Vf emitters than XP-E2 (deep) red. However, I cannot predict how well C01R will sell and how much demand they would face with different colors except for (deep) red. While red tint is widely popular I'm afraid colors like amber, green and blue might be less interesting. I hope I will be proven wrong.

I wish someday they would offer some kind of "limited 250 pcs collector's box", made of bamboo wood, with all C01S versions in multiple anodizations (black, sandblasted, no ano, red, blue, green, ...), different materials (brass, titanium, aluminum, copper) and - of course - different emitters like XP-E2 red/green/blue, UV (with LG or Seoul Viosys Z5 365nm) and a nice selection of HighCRI emitters (SST-20 2.200K - 4.000K 95CRI or LH351D 2.700K 90CRI).

Anyway, regarding your desire for amber tint the odds might be better that Sofirn offers us another version of C01S with LH351D 2.700K 90CRI, since they need plenty of those for their LT1 lantern. Maybe 2.700K is "yellowish" enough to not interfere with one's sleep?

“Everyone, deep in their hearts, is waiting for the end of the world to come.” (Haruki Murakami, 1Q84)

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The SST-20 is perfect for these small optics lights, it produces a beautiful spot. The LH351D produces more light loss and a less bright and more untidy wide spot, and it even is hardly more efficient at these low currents.

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It’d be impractical for Sofirn, so I won’t suggest it in that context, but I’m excited to get a couple of these modded with an E17A and E21A to see how those perform in C01 optics. SST-20 is definitely the largest emitter I would consider for something <15mm DIA

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Quote:
Maybe 2.700K is “yellowish” enough to not interfere with one’s sleep?

Can’t rely on color temperature — the output can look quite yellow/red and still contain a significant amount of blue light, which is what murders sleep.
(the blue emission is from the LED layer, underneath the layer of phosphors that converts those photons to warmer ones).

Turns out there are now LEDs driven using violet instead of blue, which solves the problem.

Soraa, founded by Shuji Nakamura, the Nobel Prize winner, announced a new series of blue light free LED lamp

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