Luminus SST-20-W 4000 K CRI95 color and output test

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contactcr
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ToyKeeper wrote:
I should put some on a MCPCB to see how it looks during use.

They are unobtainium apparently. TA keeping his stash secret for production lights Sad

BurningPlayd0h
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Agro wrote:
Would it be safe to use SST-20 with a FET driver in 18650 light?

A single SST-20 fries at about 7A, so triples or quads are your best bet when using them with a FET. Otherwise with a medium drain cell like NCR18650GA and a light that isn’t SUPER low resistance a single one should be fine, people have been using them in the D1S and other FET lights.

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contactcr wrote:
They are unobtainium apparently. TA keeping his stash secret for production lights Sad

Texas_Ace had his supplier send me a few, totally out of the blue. I’m not sure why. I don’t have good test equipment like maukka does, and I’ve never actually reflowed LEDs onto a MCPCB. But perhaps it’s time to start.

adam7027
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Agro wrote:
Would it be safe to use SST-20 with a FET driver in 18650 light?

Based on what I have seen in maukka’s review for CRI and output, the high CRI SST-20 is best used at around 1.5-3.5A as max current. Under 1.5A, tint is not pushed enough to or below the BBL, above 3A, but especially above 4A, color rendering for deep red (R9) starts to get somewhat worse (still above 60), and regarding efficiency, my choice is also max 3.5A, because when the current is raised above that, the gain in output is not really perceivable, but both heat production and battery runtimes go linearly worse – and above 5.5A, probably LED will degrade much faster during usage.

So if a FET is considered, a single emitter configuration will probably fry the emitter, unless other specific circumstances get the current down enough.

(But I would happily take a look at those posts, which confirm, that single emitter FET thrower builds are possible).

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Thanks to those of us who actively attract regulated drivers there are now more of them. I recommend you to stop the anathema of FET drivers and start thinking higher. Believe right, there are no limits.

 

The Light Innocent I am

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Well, I was worried that SST-20 and FET were not a great combo. But it was at the edge of my understanding of the stuff so I was not sure. Thank you all for the confirmation.

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Yeah, that’s right.
FET+SST-20+low resistance circuit = poof. Magic smoke is released.

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These newer SST-40/8A high current linears Simon requested being made feature an Atmel MCU onboard. Playing with the sense resistor also helps. I will use one as it comes for a White Flat 2mm² in a C8 but inside an S2+ with LH351D I will replace the stock R005 with an R010 (4A) or R010 plus R050 (4.8A).

They have solder mask down at the spring base. Can fix that with Cu sheet + thermal glue but it is another bummer for my spring bypass technique. 

 

Smile 

The Light Innocent I am

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Barkuti wrote:

Thanks to those of us who actively attract regulated drivers there are now more of them. I recommend you to stop the anathema of FET drivers and start thinking higher. Believe right, there are no limits.


 



Since your FET-driver crusade started, I never stopped thinking higher, and believe me, my thoughts have no limits. Unfortunately, reality does not listen to my wonderful thoughts and existing well-regulated drivers are often bulky or expensive, or at least have a medieval user interface that after I started using TomE’s and Toykeeper’s firmware, I will never tolerate.

So I keep thinking, and using my pleasant and convenient BLF-A6/bistro/biscotti/Narsil/Anduril flashlights, keep not noticing that regulation is not perfect, and in the meantime wait for the small and still powerful affordable current-regulated driver with TK-quality UI to appear from some heaven.

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djozz wrote:
Barkuti wrote:

Thanks to those of us who actively attract regulated drivers there are now more of them. I recommend you to stop the anathema of FET drivers and start thinking higher. Believe right, there are no limits.


 



Since your FET-driver crusade started, I never stopped thinking higher, and believe me, my thoughts have no limits. Unfortunately, reality does not listen to my wonderful thoughts and existing well-regulated drivers are often bulky or expensive, or at least have a medieval user interface that after I started using Toykeeper’s firmware, I will never tolerate.

So I keep thinking, and in the meantime wait for the small affordable regulated driver with TK-quality UI to appear from some heaven.


Same here. I love the idea of linear FET driven lights.

Power density is great.
Efficiency is slightly better than with our standard FET+1 or FET+N+1.
I don’t think the hardware is inherently expensive – though I am uncertain here.
Flexibility of adjusting current to match one’s needs is great. F.e. I’d love to PWM SST-20 with 2A at moon and limit to 4.5A at Turbo. Wouldn’t go particularly low but it would have good performance and consistently great light quality.

But such driver is not available.
There’s Texas Commander but it never took off.
There’s Lexel’s driver but it’s in progress.
There’s Led4Power driver but it lacks good UI.
There are several other drivers that have, yeah, medieval UI.

So for now we need to settle at sub-optimal choices. Like PWMing a FET to reduce current. Or adding large banks of 7135s. Or adding resistance. Or using only well-matched cells.
I really hate the state of affairs. But it is what it is and I am unable to do anything about it.

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djozz wrote:
… Unfortunately, reality does not listen to my wonderful thoughts and existing well-regulated drivers are often bulky or expensive, or at least have a medieval user interface that after I started using TomE's and Toykeeper's firmware, I will never tolerate.

Reality does listen to your thoughts, albeit not everything you think is something you believe.

You allowed yourself to become addicted to those firmwares. Despite being your respectable choice, as any other addiction that is bad. And those last words I left in bold in the above quote are terrible.

 

Cheers Smile 

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contactcr wrote:
ToyKeeper wrote:
I should put some on a MCPCB to see how it looks during use.

They are unobtainium apparently. TA keeping his stash secret for production lights Sad

Nah, I am not keeping them, I can’t get them myself.

I tried yesterday to get my hands on the FA3 but the manufacture is holding them with an iron grip. All I managed to get were a few samples for myself and a few others.

I can get FD2 SST-20’s but I don’t know if it would be worth the hassle as I would need to get 500+.

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ToyKeeper wrote:
contactcr wrote:
They are unobtainium apparently. TA keeping his stash secret for production lights Sad

Texas_Ace had his supplier send me a few, totally out of the blue. I’m not sure why. I don’t have good test equipment like maukka does, and I’ve never actually reflowed LEDs onto a MCPCB. But perhaps it’s time to start.

Consider it a peace offering after all the bugging you about firmware issues lol.

I knew you like high CRI LED’s and tint mixing so when they said they were sending you a box anyways I asked them to send you a few of these LED’s as well. I think they were supposed to send some FD2 as well?

I am actually going to try tint mixing a 2700k from KD, the FA3 sample I have + a 5700-6500k 70CRI SST-20 in my EDC with a 10511 optic to see if the final tint can get that rosy range we love so much.

I did this with XP-G3’s before and the final tint was surprisingly good, I ran that setup in my EDC for the past 2-3 years.

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Texas_Ace wrote:
I can get FD2 SST-20’s but I don’t know if it would be worth the hassle as I would need to get 500+.

I’d be in for 20 if by some chance a group buy was put together.

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trakcon wrote:
Texas_Ace wrote:
I can get FD2 SST-20’s but I don’t know if it would be worth the hassle as I would need to get 500+.

I’d be in for 20 if by some chance a group buy was put together.

If enough interest was shown I can get them but it is needless to say a big investment that I could not afford to hold onto long term. So I would need to know I could sell off most of them pretty quick.

Group buy pricing would be around $3 per LED I am guessing just to give an idea with discounts for higher quantities based on my talks yesterday. If I ordered 1000+ the prices would drop some but I kinda doubt there will be that much demand for FD2.

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Based on maukka’s data, I think that selling 500 of the FA3 would go pretty well, but trying to sell 500 pieces of the FD2 is a gamble.

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djozz wrote:
Based on maukka’s data, I think that selling 500 of the FA3 would go pretty well, but trying to sell 500 pieces of the FD2 is a gamble.

Yep, that is my thinking as well.

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What is their reason for only selling the FD2 and not FA3? Would love some FA3 for the more rosy tint. If not, FD2 is still better than the current FB4 by far. Vinh might be interested in buying a bunch since he uses a bunch of the FB4 tints in his lights. Richard at MTN might be interested to stock some too if you can’t get the quantities you need.

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At the moment I can get up to 2k I think.

The FA3 they are planning on using in an upcoming light and don’t want to let any go before that sadly.

Interesting idea, I could try talking to Vinh and MTN to see if they are interested in some of them.

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Btw, output-wise the FA3 did just as well as the FB4 in the OP, 307 lm at 1A. The FD2 did 319 lumens. At 5 amps FA3 did 934 lm, FD2 980 lm (not using a copper hs like in the OP and graphite pad instead of thermal paste).

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Thanks for the info Maukka. Surprised it is the same high flux bin considering the FA3 and FD2 is a better tint than the FB4.

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Texas_Ace wrote:
I tried yesterday to get my hands on the FA3 but the manufacture is holding them with an iron grip. All I managed to get were a few samples for myself and a few others.

I can get FD2 SST-20’s but I don’t know if it would be worth the hassle as I would need to get 500+.

BlueSwordM recorded interest in 412 × 4000K SST-20 so far in a group buy thread he was running. He already made a group buy of 3500K, but 4000K has been on hold for a couple of months due to not being able to confirm availability of anything better than FB4.

http://budgetlightforum.com/node/64047

Perhaps FD2 is good enough to start trying to get a 4000K group buy in motion again?

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iamlucky13 wrote:
Texas_Ace wrote:
I tried yesterday to get my hands on the FA3 but the manufacture is holding them with an iron grip. All I managed to get were a few samples for myself and a few others.

I can get FD2 SST-20’s but I don’t know if it would be worth the hassle as I would need to get 500+.

BlueSwordM recorded interest in 412 × 4000K SST-20 so far in a group buy thread he was running. He already made a group buy of 3500K, but 4000K has been on hold for a couple of months due to not being able to confirm availability of anything better than FB4.

http://budgetlightforum.com/node/64047

Perhaps FD2 is good enough to start trying to get a 4000K group buy in motion again?

Interesting, while the FD2 is the best tint out yet I would guess that FA3 or better would be needed to gain that amount of interest. That is about what I figured the interest level would be if I could get the FA3.

I am guessing less then half the interest for FD2.

I know I would want some FD2’s to play with I would not stock up on them to use in a lot of lights, I would wait for something better to come along.

It is possible we could get enough interest to make an FD2 buy worth it. I would need to sell at least half of them right away to cover most of my costs minus the LED’s I plan to keep for myself.

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Who knows though. Some better LED could come along with less tint shift by the time you get this ideal tint

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contactcr wrote:
Who knows though. Some better LED could come along with less tint shift by the time you get this ideal tint

Yeah, part of why I am not rushing into the FD2. The FA3 was enough of a step up to be worth jumping into but the FD2 is a smaller step.

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I received the batch of FA3 and FD2 SST-20 leds today, that Texas_Ace had sent to me. Thanks TA again for these.

This evening I did the test I was most curious of: modding 3 of the FA3 leds into my freshly received FW3A.

(I did all the tint checks with the FW3A’s AR-coated lens in place, I hope and think that using a plain glass lens will make results only slightly different, not much)

And as expected from the effect of the optic, even the FA3’s were not enough to get the tint in the hotspot below the BBL at any current. You have to start with very obvious rosy leds to get that done.

Also on inspection by eye, the beam has no rosiness to it.

Instead I got a very nice neutral tint in the hotspot (close to 3950K at all levels) that has not even a hint of green. Just as neutral white as 4000K can be Thumbs Up
The beam next to my Sofirn C01S, that has a 4000K 95CRI SST-20 of unspecified tint (so likely FB4), makes the C01S look more green, so these leds have indeed visibly a different tint closer to the BBL.

The CRI is between 96.5 (turbo) and 97.6 (close to highest ramp level) on all currents, with R9 between 86 (turbo) and 98 (close to highest default ramp level).

Also at the lowest levels the hotspot has no visible green. The duv went from 0.0015 (very low level) to 0.0022 (highest default ramp level) to 0.0005 (turbo).

For comparison, the Sofirn C01S has a duv of 0.037 (high) and 0.034 (low). (The C01S also has a TIR optic, but it may be optically a bit different from the Carclo 10570).

I feel quite spoiled to have such nice leds in my FW3A.

Later (I hope tuesday) I will check a FA3 led and a FD2 led in a S2+ reflector at a few relevant currents.

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djozz wrote:
Later (I hope tuesday) I will check a FA3 led and a FD2 led in a S2+ reflector at a few relevant currents.

This would be great! Thank you for sharing your findings too!

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Guys, if you can offer me somewhere to put a payment, I could order those LEDs.

Would be nice for my 3rd gen BeCu springs+ LED GB.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

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