Hanks 6500k (intl-outdoor) is the nicest bin I have seen out of the 5-6 bins I have bought since last summer from various suppliers. It's doesn't "feel" like 6500k, and it has a really nice clean tint with almost zero green.
Does he sell the SFT40 separately? I couldn’t find a listing for them.
How suitable is the SFT40 to put in a BLF Q8? Could they take the FET drive? How would it compare to XHP50.2 emitters?
Probably, as long as he has them stocked for the flashlights he’s offering. Just ask him and he’ll give you a quote for that specific emitter. I bought some other unlisted LEDs from him without issues.
If your intent is to re-flow onto Sofitn’s Q8 Pro Q8. it is compatible and was done by Sofirn a while back as the 50.2 (3 volts) were not available. Mind you they were the SST40 which is basically the same but domed.
If you want to upgrade your existing BLF Q8, the footprint of the XPL-2 is 3535 and the SFT 40 is 5050. Some members got hold of a re-vamped MCPCB from Led4Power with such intent. Perhaps one would chime in…
As for beam quality, the SFTs are more throwy and have fewer artifacts less green than the XHPs. As for lumens, it depends on the electrical path as any minute resistance hinders the performance.
Yeah, I just bought a pair. Probably easiest if you have a regular order to add it to. Just email him first to get a quote on the emitters, place your regular order on the website, and then send an extra Paypal payment for the extra stuff with a message to add it to the existing order. That way he can process the order normally, and just toss the extra stuff in the box.
i ligted my sigaret with the sft 40 then the fosfor top layer burned and …. turns out its an blue led …. someone knows how many kelvin? … sorry for the crappy english im dutch…
You LIT YOUR CIGARETTE with the SFT40 LED?! You win the best-first-post-ever award, hands-down.
The underlying blue emitter does not have a well-defined CCT in Kelvins. As you see, the curve representing blackbody radiation converges to a point in the interior, not boundary, of the color space, so any color more blue than that limit point would not have a CCT.
I want to convert my Convoy C8 + to a diode SFT40 and a 10A driver. Is there such a driver 10A? Give me a link.
You’d be needing that to be FET driven and most likely needing to bypass both springs.
I don’t know if SFT and the C8 host is a good combo for 10 amps given what we’ve seen in this emitter. Maybe Simon’s 8A driver with thicker led wires and spring bypasses is a better choice. I did that in an L2 host and it’s been running fine (single cell) even with longer run times on high and turbo with 26800. The C8 can’t dissipate nearly as much heat and 10A seems to be above the safer limit for this emitter with good heat sinking. The lumen gain going from 8A to 10A isn’t very significant anyway.
At the beginning of the topic there is a graph and the biggest difference is just around 10 amperes. Is there a 10 amp 20 mm driver?
Before 10A you can see the curve lessening a little around 8A…10A is clearly stressing the emitter as it fails soon after with not much more current, and these are also fairly brief tests. But throughout this thread and elsewhere we’ve seen a lot of failed SFT-40 emitters at less than 10 amps…whether those were due to current/heat or cleanliness with flux/debris on the surface isn’t totally clear, or if different batches from our vendors made any difference. I’d say give it a shot if you want to, but have a spare emitter or two for replacement if need be, and be vigilant about removing anything on the emitter surface before assembling and running the light (also be mindful of any fumes/outgassing from thermal paste, glue, etc.).
I don’t know of any 10A drivers other than a FET like Funtastic said, but mind the cautions earlier in this thread about methods to limit that full-open current.
With a 10 amp driver, due to losses, no more than 8 amps will go to the diode, I think. Do you have a link to this driver? Can it be bought?
I would really recommend staying below 8A. The gain is output is completely unnoticeable, but the increased heat and shortened runtime is noticeable. Some SFT40s are known for the "black spot of death" issue, another reason to keep the current conservative. I'm running it around 6-7A in a C8 with ramping driver, and extremely happy with its performance. BTW a C8 takes 17mm driver not 20.
Maybe that ramping driver with a lower value sense resistor to boost the current. You can also do this on Convoy’s 5A drivers. I can’t remember the thread that gives the formula to work out the value resistor needed though
Will SFT40 be warmer than 6500K? I need 4500K or 5000K
FYI kaidomain has the 5000k. Edit: and it’s the DA tint bin, which has a good chance of being on or below the bbl!
Edit again: I was unable to order due to one of the required options for adding it to your cart being missing. I emailed them about it and now the entire listing is gone. Hopefully they’ll put it back soon.
Over in the Convoy thread, Simon recently teased a sample of the 3000k, so hopefully more soon!
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So the high CRI SST40 finally happened after what is it? 4 years? Even if it is the SFT40. I would not have mind it to have been the the SST40, with a shaved dome the duv would have been more perfect than the SFT40 will be. But I will be happy to use some of these 
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