Sofirn C01R deep red [sold out, discontinued]

Thank you Djozz + Barkuti. I will forward these valuable information to Sofirn and try to convince them taking extra care of the sense resistor. I have no idea how much effort they expect in modifying their C01S driver but with the obvious benefit of significant better output it should be worth it.

Do you guys think it's worth using 0.22Ω resistors for other C01S emitters, too? If it turns out to be general advantage for LEDs like SST-20 2.700K/4.000K 95CRI or LH351 2.700K 90CRI, it should be even easier to convince them.

I see the problem, according to Cree datasheet the minimum luminous flux for a P3 bin red XP-E2 at 350mA/85°C is 73.9 lumens, while you measured just ≈53; (53 × 100) / 73.9 = ≈71.72% of actual output (pretty sure slightly bit larger difference actually since djozz's P3 red wasn't at 85°C).

Interesting, because if Sofirn gets his hands on P4 binned red XP-E2s, if they dare to bump the driver current for red emitters the raw emitter lumens for the red C01R will be 80.6 × (75 / 53) = ≈114. With regards to the photo red, the raw lumens figure will probably be ⅓ of that number for standard sensitivity humans.

Sun, 11/03/2019 - 21:11

Interested

0.22Ω ≠ 0.2Ω. Since sense voltage in the C01S driver is ≈350mA × 0.27Ω = ≈94.5mV, with an R22 current is raised to I = V / R = 94.5mV / 0.22Ω = 429.5̅4̅mA. With an R20 current is 472.5mA.

Concerning raising the current for all emitters, that is a different story because they have a higher Vf, this forces the driver to output more power, working harder and draining the battery harder and faster too.

Okay, got it. ;-) I will report about any news as soon as possible.

Interested tn OD green or tan ano!

In for one in Deep Red if the price lands around $11 as expected.

For sure interested in 660nm

Red anodizing preferred, but not necessary

np with the color, standard red body color works for me too…

@ Barkuti + Djozz: Sofirn's engineer says there is not enough space left on the C01S driver to use an R20 sense resistor. He also tested the XP-E2 deep red LED using the C01S driver.

His feedback is:

红光vf太低,红光低亮的时候,这个电压不足以支撑单片机工作了

the vf of red led is too low, when at low mode, the voltage is not high enough for the chip

What do you suggest Sofirn to do?

As I’m not an electronics person, the short answer is: I don’t know.

People like HarleyQuin, DEL, LoneOceans could maybe help designing a driver.
Btw, it sounds a bit surprising that a R20 resistor can not be added. Perhaps not with the current layout but with some shifting traces or switching positions I can imagine it can be done. In that case maybe Lexel is your partner, if he is willing to do that, if Sofirn can provide the current driver layout digitally, he is very handy with drawing lay-outs, and he is fast.

Interested in 1x deep red :slight_smile:

If I put 红光vf太低,红光低亮的时候,这个电压不足以支撑单片机工作了 in Google Translator I can discern among a bit of nonsense :-) that the Vf of photo red emitter is too low for the driver to work properly.

So, it doesn't matters if they can't fit an R20 in the C01S driver (I bet I'd fit it ;-) but of course they're speaking from a manufacturer's pragmatic viewpoint), as djozz points out the C01R needs a new driver.

Thank you both. I asked for the driver schematics but I could imagine they don't want to distribute them around for reasons of nondisclosure. Anyway, I try my best to keep the link alive between BLF and Sofirn's engineering. I was told that Sofirn's engineer will find an alternative way to make the XP-E2 deep red work with the C01S driver. I don't have any details yet. Maybe they find an alternative way to modify the sense resistor. As far as I can understand their response Sofirn tries to avoid using an individual driver (design) for C01R as this would go in line with significant cost increases.

[quote=Lux-Perpetua] …

Thank you both. I asked for the driver schematics but I could imagine they don't want to distribute them around for reasons of nondisclosure. Anyway, I try my best to keep the link alive between BLF and Sofirn's engineering. I was told that Sofirn's engineer will find an alternative way to make the XP-E2 deep red work with the C01S driver. I don't have any details yet. Maybe they find an alternative way to modify the sense resistor. As far as I can understand their response Sofirn tries to avoid using an individual driver (design) for C01R as this would go in line with significant cost increases.

[/quote]

The C01S driver design is no big deal, many people here could even design one from scratch in little time…

As said before (based on Sofirn engineer's report) the C01S driver needs some modification to properly drive photo/deep red emitters. It is a bit surprising, imho, as alkalines will quickly drop below 1.5V under load (I doubt there is a problem with Ni-MH).

Concerning the problem with the sense resistor, it seems like a porky pie to me, smells like they're hesitating to make further driver modifications plus having to purchase a reel of sense resistors. But in light of the engineer's report, they will have to modify the driver for the C01R. So, I find little reason not to swap the sense resistor too. You can tell 'em this without beating around the bush. ;-)

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?

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

Interested in 2x deep red please :slight_smile:

They both are very low voltage.

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.