Luminus SST-40, a N4 BA bin tested

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KawiBoy1428
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I’m still waiting on (15) SST-40’s??? Hopefully this weekend, it’s supposed to be a beautiful, cold and rainy weekend here!! WinkThumbs Up

KB1428 “Live Life WOT”

Lightbringer
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Jerommel wrote:
This story gets stranger by the hour.. A driver difference causing such a tint shift? It’s actually hard to believe..

Not really. My Quark 2AA-X does that. On turbo, it’s not too bad. On moonlight, greeeeeeeeeen.

I think it’s that when driven hard, other phosphors than green come out fine (“underdriven”, as far as phosphors go), and green saturates. When driven not so hard, a predominant green really comes through.

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

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Fet only driver uses pwm only to dim the led. When using fet and pwm the led sees the same max current on all levels just for shorter periods of time. Cc drivers reduce the current and show it to the leds constantly. An led generally shows more color warms up a bit at lower currents as aposed to higher currents where the led shows less color and becomes cooler k wise. Usually increasing the current to the led will continue to get cooler till the point when it starts turning blue and then poof.

So in the case of the traveling green curse above there are two scenarios :
1.) the led is getting less current and showing more green color,
2.) the led is overdriven and turning green.

If the driver is causing the trouble it would have to be because if scenario two. As it is an fet only driver and show max current to the led at all times. Even so leds usually turn blue when over driven not green. However thus led shows a “new” tint that is generally unfamiliar. Does anyone know if overpowering an sst40 turns the tint to green?

Very weird to see such a difference! If there is some other aspect of this driver, other than the curse, that would open up some new parameters in the search for good tints:)

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Huh… just thought of something.

LEDs, whether warm or cool, have a weak spot in the bluegreen area of the spectrum. There’s not enough difference in wavelength to reradiate bluegreen from a blue light. Just like new LEDs use violet LEDs to excite phosphors for better “blue-end” response, maybe the shift towards “bluer” with high currents creates less “green tint” (not sure where exactly in the spectrum this’d be, more like yellow-green from what I recall).

It was… maukkona(?sp)… who did the spectral stuff with LEDs. Anyone want to engage him to do that for the same LED but different drive levels?

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

Agro
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LightRider wrote:
Fet only driver uses pwm only to dim the led. When using fet and pwm the led sees the same max current on all levels just for shorter periods of time. Cc drivers reduce the current and show it to the leds constantly.

Not really. It was measured in the D4 thread that with fast PWM current is always in some intermediate state.
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LightRider wrote:
Fet only driver uses pwm only to dim the led. When using fet and pwm the led sees the same max current on all levels just for shorter periods of time. Cc drivers reduce the current and show it to the leds constantly. An led generally shows more color warms up a bit at lower currents as aposed to higher currents where the led shows less color and becomes cooler k wise. Usually increasing the current to the led will continue to get cooler till the point when it starts turning blue and then poof.

So in the case of the traveling green curse above there are two scenarios :
1.) the led is getting less current and showing more green color,
2.) the led is overdriven and turning green.

If the driver is causing the trouble it would have to be because if scenario two. As it is an fet only driver and show max current to the led at all times. Even so leds usually turn blue when over driven not green. However thus led shows a “new” tint that is generally unfamiliar. Does anyone know if overpowering an sst40 turns the tint to green?

Very weird to see such a difference! If there is some other aspect of this driver, other than the curse, that would open up some new parameters in the search for good tints:)

How many amps are you referring to when you’re talking about overpowering the LED? With the FET+7135 the lowest modes shows very green tint, but the two highest shows none. This driver draws 8.6A on turbo and the tint is perfect white. So at that amperage it doesn’t turn the sst-40 green.

Jerommel
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Agro wrote:
LightRider wrote:
Fet only driver uses pwm only to dim the led. When using fet and pwm the led sees the same max current on all levels just for shorter periods of time. Cc drivers reduce the current and show it to the leds constantly.

Not really. It was measured in the D4 thread that with fast PWM current is always in some intermediate state.

That would be the case when the PWM frequency is somewhere up in the MHz range, which is probably not the case in the D4 driver.
You would need a serious HF FET for that too, or it will get hot.
I guess it must be the current meter that smooths things out.
(but i haven’t seen the post you’re referring to)

..waiting for parts..

Still looking for 5” parabolic reflector (for recoil light)

Agro
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Jerommel wrote:
Agro wrote:
LightRider wrote:
Fet only driver uses pwm only to dim the led. When using fet and pwm the led sees the same max current on all levels just for shorter periods of time. Cc drivers reduce the current and show it to the leds constantly.

Not really. It was measured in the D4 thread that with fast PWM current is always in some intermediate state.

That would be the case when the PWM frequency is somewhere up in the MHz range, which is probably not the case in the D4 driver.
You would need a serious HF FET for that too, or it will get hot.
I guess it must be the current meter that smooths things out.
(but i haven’t seen the post you’re referring to)

http://budgetlightforum.com/comment/1168928#comment-1168928
Jerommel
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Thanks.

..waiting for parts..

Still looking for 5” parabolic reflector (for recoil light)

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So, about Toluene.
Want to get some so I give it a look and guess what, there is a local company making this stuff, I was excited, could it be, source in my own town! Picked up the phone, give them a call, yes they produce it, yes they sale it but I can’t buy it because they don’t have retail store, and they don’t want to give me info which company buys from them and has retail store so I could contact them.
Bloody bureaucracy Angry

 

EagleShield
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What is the best forward voltage bin for this led for flashlights with the A17DD or X5/X6-driver?

Forward voltage bins for sst-40

As giorgoskok wrote, the sst-40 specs from aliexpress store: Shenzhen Great Technology Co.,Ltd.

Flux : N4
Color : BA
Voltage: VK (min: 2.9V max: 3.1V)

You see that there are 2 bins lower then the VK bin and I guess if you use those with DD-FET driver you get more Amps (if I understand this correctly) then the VK bin but that means more heat.
Are those VH and VJ bins better (more Amps = more light) or are they so good they get worse (to much amps = to much heat and the led burns)?

Edit: removed a picture as requested (couldn’t they just go to Kaidomain’s site and copy that picture instead?)
.

EagleShield
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I see that Kaidomain’s Sst-40 have the VJ bin (Min: 2.7V Max: 2.9V).

Anyone who have both the aliexpress sst-40 (VK bin) and the Kaidomain’s sst-40 (VJ bin) that have made a comparison?

.

giorgoskok
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It would be better not to post the pic of the reel here EagleShield !

Thanks

Agro
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giorgoskok wrote:
It would be better not to post the pic of the reel here EagleShield !

Thanks


Why?
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Agro wrote:
giorgoskok wrote:
It would be better not to post the pic of the reel here EagleShield !

Thanks


Why?

In the past sellers have goten pics etc from forums (+ it appears in google pictures) etc selling fake leds and more.

Agro
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OK…

giorgoskok
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Agro wrote:
OK…

At least happened to me once from ebay seller Cash

EagleShield
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giorgoskok wrote:
It would be better not to post the pic of the reel here EagleShield !

Thanks

Removed it Smile

.

Agro
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The SST-40s from Aliexpress come on PCBs.
Are those PCBs total junk, just bad or mediocre?

Sledgestone
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Got a link?

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Sledgestone
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Yeah, those are crap. No copper, just aluminum. Get yourself some noctigons from hank! Thumbs Up

Agro
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Aluminum isn’t a top performer, but isn’t bad either. If these are DTP, they should be passable for cheap lights….and Kaidomain PCB + LED costs about the same as Aliexpress LED (when buying 10) + Noctigon. Similar DTP, but Aliexpress diodes are factory rejects of random bin and with KD one knows what they buy. There is an intermediate option of using KD PCBs ($1.5/piece) with Aliexpress emitters though.

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Agro wrote:
https://www.aliexpress.com/item/10PCS-Luminus-SST-40-10W-LED-1100lm-Cool...

Wasn’t it that seller someone reported to sell fake sst-40? (When buying small amount it was the real sst-40 that came but when he did a bigger order and he got fakes?)

I don’t have seen anyone reported the other seller (Shenzhen Great Technology Co.,Ltd) to sell fake sst-40.
I asked them to sell only the LEDs because their PCB is crap and it can’t handle the heat when pushed hard.

I got this response:

hi dear friend
I just sell it with pcb .Because some customer brought it back and they don’t know how to make it on the pcb.Then they open the dispute .I have no way deal with it .So i just sell it with pcb now
I hope your understanding
Enjoy your day
Jacky

So I checked the store and they sell Xhp70 and xhp35 Hi without their crappy PCB.
So I wrote another message and told them that and what they wrote in the last message don’t add up.

Got this reply back:

hi dear firend
I sell the sst-40 led only with pcb .NO bare led for sell .
BR
Jacky

So still little fishy..
Why won’t they just cut the amount of LEDs from the reel and sell? Should be much easier.
Only option I can think of why they would not sell any loose LEDs is because they already put them all on their PCB stars.
But then why not just write that to me instead of making up that story?

I bought 1 of every size PCB with the sst-40 (I think).
Buying from aliexpress is like opening Christmas presents. You never know what’s in it.

.

Sledgestone
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Agro wrote:
Aluminum isn’t a top performer, but isn’t bad either. If these are DTP, they should be passable for cheap lights….and Kaidomain PCB + LED costs about the same as Aliexpress LED (when buying 10) + Noctigon. Similar DTP, but Aliexpress diodes are factory rejects of random bin and with KD one knows what they buy. There is an intermediate option of using KD PCBs ($1.5/piece) with Aliexpress emitters though.

Well it depends. If you’re going direct drive (where the sst-40 really shines) a copper mcpcb is a must.

Agro
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EagleShield wrote:
Agro wrote:
https://www.aliexpress.com/item/10PCS-Luminus-SST-40-10W-LED-1100lm-Cool...

Wasn’t it that seller someone reported to sell fake sst-40? (When buying small amount it was the real sst-40 that came but when he did a bigger order and he got fakes?)

I don’t have seen anyone reported the other seller (Shenzhen Great Technology Co.,Ltd) to sell fake sst-40.
I asked them to sell only the LEDs because their PCB is crap and it can’t handle the heat when pushed hard.

I got this response:

hi dear friend
I just sell it with pcb .Because some customer brought it back and they don’t know how to make it on the pcb.Then they open the dispute .I have no way deal with it .So i just sell it with pcb now
I hope your understanding
Enjoy your day
Jacky

So I checked the store and they sell Xhp70 and xhp35 Hi without their crappy PCB.
So I wrote another message and told them that and what they wrote in the last message don’t add up.

Got this reply back:

hi dear firend
I sell the sst-40 led only with pcb .NO bare led for sell .
BR
Jacky

So still little fishy..
Why won’t they just cut the amount of LEDs from the reel and sell? Should be much easier.
Only option I can think of why they would not sell any loose LEDs is because they already put them all on their PCB stars.
But then why not just write that to me instead of making up that story?

I bought 1 of every size PCB with the sst-40 (I think).
Buying from aliexpress is like opening Christmas presents. You never know what’s in it.

.

Thanks for correction, the right seller is:
https://www.aliexpress.com/store/product/10PCS-100PCS-Luminus-SST-40-10W...

Agro
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With SST-40 driven with FET you can pretty much extrapolate the chart right, so the difference will be higher. Nevertheless, alu will do the job.

EagleShield
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If I understand that chart right it’s only the Mcpcb with DTP that will do ok?
The common alu mcpcb will get to hot and fry the led when driven hard?

I don’t think those mcpcb stars they sell on aliexpress have DTP.

LightRider
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EagleShield wrote:
If I understand that chart right it’s only the Mcpcb with DTP that will do ok?
The common alu mcpcb will get to hot and fry the led when driven hard?

I don’t think those mcpcb stars they sell on aliexpress have DTP.

Yes^3

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Various sst-40 leds tested, lumens are being count with my home made pipe.
NCR18650B protected fully charged battery, will use 30Q soon.

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