Sofirn C01R - XP-E2 deep red AAA keychain flashlight

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shirnask
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Interested!

adam7027
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Ryzbor wrote:
Interested only in deep red.
620nm is to rosy-orange-ish for me instead of red.
There are already a lot of 620nm lights on the market and sourcing 620nm XP-E2’s in single quantities is super easy so having a photo red led would make this light stand out.

+1 Thumbs Up

I can even see 730nm (which is called ‘Far red’), but my eye sensitivity is noticeably worse there (but I can still pick up that distinct deep red color very easily – and it is still much-much better than looking into 780nm near-IR LEDs). But, when I compare it to an ordinary 625nm red, the latter just looks like a very deep orange (or ‘light red’).

660nm could be a sweet spot, as the human eye still has fairly good sensitivity to that – despite it is a ‘redder’ red.

Speaking about special light sources, there are even less ‘lava’ or ‘ultra warm white’ flashlights around.

But there could be a potential, I mean, the BLF community already accessed and tested a few very good emitters:
Luminus Xnova Cube (1800K, 90CRI)
Nichia E21A (which has 2000K CCT variant with CRI 95 and R9 above 90)

For some applications, I could even imagine using a 1300K to 1600K CCT emitter, but unfortunately I haven’t see a good one yet. The trick in having a non-monochrome (but still very ‘dark adapted eye friendly’) light source, that one still can perceive colors (just blue light is making up a very tiny part of the emitted spectrum, and cyan/green light is still rather slim), and it covers most of the situations, where previously 625nm red lights were used, but it is easier to see with.

So, if I think about alternative C01 versions (just hypothetically, based on my needs/preferences/wishes), I would be in for C01L (‘Lava’), and C01DR (‘Deep red’).

By the way, I do know, that doing negotiations with flashlight manufacturers is a meticulous task, so I thank you for your efforts.

MascaratumB
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Lux-Perpetua wrote:

Está feito, MascaratumB. Smile Obrigado pelo teu interesse.


Muito obrigado, Thomas!
Danke sehr!! Wink

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Interested, prefer Deep Red, but would buy a “normal” red.

More Photons!

808Hi
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Interested in 2

AndyMac2272
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Interested in 1

 

AndyMac222777

Skuzapo
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Count me in for one

iamlucky13
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Lux-Perpetua wrote:
I’m afraid that XP-E2 photo red (I guess it’s being called “deep red”, too now) could look too dim/too dark as the output is less than XP-G3 deep red. Please bear in mind that 660nm is closer to the edge of the human eye’s visible spectrum, i.e. 100 lumens of deep red (660nm) light will appear significantly less bright than 100 lumens of red (625nm) as the eye’s reception is less sensitive on 660nm.

I think it should be noted that the definitions of the lumens and lux already take into account the varying sensitivity of the human eye to different wavelengths. In contrast, the related terms radiant flux and irradiance do not take that into account.

So 100 lumens of 660nm deep red should appear the same intensity as 100 lumens of 625nm red.

The difference in practice is you get fewer lumens for the same power.

So while Cree rates the red XP-E2 for up to 80 lumens at 350mA, based on the function that approximates the sensitivity of the human eye, the photo red XP-E2 probably only puts out about 15 lumens (Cree only rates it in mW, not lumens).

2Ace
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Interested in 3

cyropro
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Interested, in for 2

nastynate
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Also interested in one.

t-soung
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I’m interested in red and deep red.

OldSkol
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Add 1 for me please
Cheers

mili111
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One more for me plz, total of 2 Big Smile

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iamlucky13 wrote:
So while Cree rates the red XP-E2 for up to 80 lumens at 350mA, based on the function that approximates the sensitivity of the human eye, the photo red XP-E2 probably only puts out about 15 lumens (Cree only rates it in mW, not lumens).
This is an acceptable trade-off for me. It would make it appear approximately half as bright, which is noticeable, but this was never meant to be a powerful red flooder, just a dedicated red flashlight for use in low light conditions.

Perhaps offering the option of XP-E2 Red and XP-E2 Photo Red would be easier for Sofirn? Unlike XP-G3, these 2 emitters seem to be very similar. No additional effort may be needed to offer both as an option, it would probably be a straightforward emitter swap.

mxyzptlk
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I’m also interested in 2.
Thanks!

Lux-Perpetua
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84 pcs accounted for already. Thumbs Up Only 116 pcs left to make it happen. Wink

Luminous and wired, we'll be glowing in the dark.

Unheard
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When … ok, if Sofirn decides to go for deep red, I’ll take 2. Just saying! Big Smile

1stein
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In for one piece of each LED version.

nobody
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Put me down for 1 more please

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1stein wrote:
In for one piece of each LED version.

Cześć 1stein, just to be sure...I count this as 2 pcs as long as we don't know what LED we get? Smile

Pozdrawiam, Thomas

Luminous and wired, we'll be glowing in the dark.

1stein
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Lux-Perpetua wrote:

1stein wrote:
In for one piece of each LED version.

Cześć 1stein, just to be sure…I count this as 2 pcs as long as we don’t know what LED we get? Smile


Pozdrawiam, Thomas

Cześć, you are so language gifted. Chapeau Bas! Yes, count me for 2 in this case, thank you.
Pozdrawiam serdecznie Big Smile

pies
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Interested.

Phosphor22
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interested in one

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Lux-Perpetua wrote:

I'm afraid that XP-E2 photo red (I guess it's being called "deep red", too now) could look too dim/too dark as the output is less than XP-G3 deep red. …

First of all, XP-G3 deep red is also called photo red.

According to XP-G3 and XP-E2 datasheets the actual XP-G3 versus XP-E2 radiant flux difference is very small. Just for example right now Arrow has XPGDPR-L1-0000-00F01 (XP-G3 radiant flux code 32, 500mW @ 350mA and 25°C) and XPEBPR-L1-0000-00D01 (XP-E2 radiant flux code 30, 450mW @ 350mA and 25°C).

XP-E2 is the safe bet in this case, imho

The Light Innocent I am

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Lux-Perpetua
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Gracias Barkuti Beer I'll keep that in mind when talking to Sofirn again. I ask them to concentrate on XP-E2 deep red only when testing alternatives to XP-E2 red 625nm. OP will be updated accordingly.

Luminous and wired, we'll be glowing in the dark.

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Interested.

dk21291
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Lux-Perpetua wrote:
84 pcs accounted for already. Thumbs Up Only 116 pcs left to make it happen. Wink

Has Sofirn confirmed that with an interest list of 200 they will produce a run?

Propeak
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Hey Lux-Perpetua love this idea, thanks for another custom BLF project. Please up me to 3 in total, maybe more later.
These would make awesome stocking fillers but it’s unlikely the timing will work out.
Nevertheless, good things come to those who wait!

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Lux-Perpetua be sure to tell Sofirn to avoid being tight fisted when purchasing the photo red emitters, i.e. to preferably get a high flux bin XP-E2 since the bulk per unit cost differente will be very small.

BLF user koef3 and user Köf3 in TLF tested an XP-E photo red ≈3 years ago. Worth taking a look.

Also, since the C01S driver is rated for ≈1W the driving current for the XP-E2 photo red could be slightly raised without exceeding the maximum rated power. To 450 or 500mA, a current sense resistor swap is all it takes:

 

 

Photograph of the stock driver courtesy of djozz. Wink

Presuming 350mA stock driving current swapping the R27 by an R20 means the current goes up to ≈472.5mA, which is compensated by the photo red emitter's low Vf. This would help making the torch brighter at ≈600mW raw output (close to 25 raw emitter lumens). All in all, it could surpass 20 OTF lumens in high. Innocent 

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Deleting a post and redoing it causes the forum thread answer notifications to become invalid. Thus, if you need to change your just published post, edit it. Thanks.

Please avoid quoting lenghty posts, namely with nested quotes. Trim the quote down to the essential. Helps with forum neatness and legibility. Thanks.

Sharing localized AliExpress links is bad: when a user clicks or taps on a localized link their system automatically sets that locale, most often forcing the user to tap or click on the locale drop down or global site link to return to their localized site of choice or to the global site. Your carelessness is thus detrimental. I understand AliExpress should fix their site behaviour, but while this happens please be mindful and only share global website (english) links. Turning a localized link into a global link is super easy, just change the locale letters in the url for wwwExample:

https://es.aliexpress.com/item/bla-bla-bla.html turns into https://www.aliexpress.com/item/bla-bla-bla.html. Thumbs Up

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