Luminus SFT40 test

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Sidney Stratton
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Just a side note:

Really inexpensive little light meter that gives some valuable info other than lux – under $20 USD (link in pic).

I’m still waiting for mine. Ordered some 2 months ago and things have gotten down to a snail’s pace. And I can’t claim a refund before 90 75 days. I’ve gotten lost in my purchases and future mods. Scratching my mind in my intentions – Simon’s order is lost and that was key to some of my projects.

merlot
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Henk4U2 wrote:
merlot wrote:
djozz wrote:
Domeless leds require the reflector a bit deeper, so going from SST40 to SFT40, a thing to do is sand the centerpiece thinner to get the focus correct again (assuming the stock light has perfect focus).

If you dont mind could you elaborate on this please? I’ve recently put a domeless emitter in a convoy s21a and it has a dark spot in the middle of the beam, I think from not being focussed. properly. When you say “sand the centrepiece thinner”, do you mean the bottom of the reflector? So the same thing as making the centering ring thinner? Is the aim to make the LED sit a bit further in to the reflector? Thanks in advance

A dark spot in the middle of the beam does not necessarily mean it is not focussed properly. At what distance from the white wall (I’m guessing) were you standing when you observed this “donut”? It may very well disappear after you move away from the wall. Try that angle before you attack the backside of the reflector.

It doesn’t seem to be affected by distance; its still evident at 10m. I’ve just added some DC-fix and the beam is lovely and smooth now.

djozz
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Hmm, that requires me buying some first. Will think about it… Smile

Deluminator
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Just a heads up. I messaged Simon on aliexpress, about sft40 5700k. And they responded its 6000k-6500k now. So im assuming, that he is selling the Original bin sft40 again.

Looking to buy used Reylight Pineapple & Acebeam M10? PM ME

1stein
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Just my 2 cents on what I’ve found so far.
I got more familiar with SFT-40, turned around a dozen or more and came up with my own conclusions.

I certainly may be wrong, but judging from so far experience, it seems these LEDs are prone to have “black pixel” on the surface. It seems they appear when anything lands on the LEDs surface and when it’s lit up the dirt (or whatever) melts into the phosphor layer.
I’ve received a few brand new flashlights with that glitch. But surprisingly I was able to clean that “black pixel” with the IPA spirit cleaner. Furthermore, the cleaned pieces seem to be OK when lit up with 6,7,8 Amperes.

Since I take a special care to keep the soldering clean, the “black pixel” do not pop up. Those received with “black pixel” I clean (very gently) and they seem to fine afterwards.

So maybe it’s just a matter of paying attention to clean work. And if it fails, gentle cleaning seem to give positive effect.

We’ll see how it develops further.

JaredM
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I wonder if a thin application of LED Seal to these SFTs while still in the reel would solve this issue.

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story
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Today I put in the FC12 board with the SFT40 into the Sofirn SF11 which uses four AAs. Everything fits (barely) without mods and the beam looks about the same as the Wurkkos FC12. I didn’t think of the voltage before I ran some test seeing and it works fine. I haven’t done a battery run test yet.

Is it suppose to be like that?

polarweis
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I just put a sft40 from simons store into my s21a. Everything worked fine before with w2 led that was in it before. Now the low mode does not work(4 mode 6amp convoy driver). Does anyone know why the low mode would not work? Other three modes work fine. I tried other tailcap and full 50e and 40t battery but same result.

"It wouldn’t be so bright if there wasn’t a shadow every once in a while." - Jason Mraz

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How Low is the low mode?

I have observed the same behaviour in my Noctigon KR1 that initially had a W2 and which i gave an SFT40 emitter swap. (SFT40 Bought from Simon)
The low mode does not work, the LED is just completely switched off, while the light is switched on in Low.

Luckily, Anduril supports programming of the lowest and highest ramp.

My S2+ with SFT40 and A6 driver works well in all modes

polarweis
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I think low mode is 0.1 percent.
Sst-40 worked normally before as did w2. Maybe running the w2 screwed something up? It did get very hot a couple of times.

"It wouldn’t be so bright if there wasn’t a shadow every once in a while." - Jason Mraz

polarweis
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Just now noticed that on the second mode the sft40 very slighlty flickers. third and forth modes are normal.

"It wouldn’t be so bright if there wasn’t a shadow every once in a while." - Jason Mraz

Yokiamy
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polarweis wrote:
Just now noticed that on the second mode the sft40 very slighlty flickers. third and forth modes are normal.

Yep, my KR1 does that too!
Lowest ramp is now set to 15 clicks, where you can slightly see it flicker, but it seems to be almost as low as possible current.
Running higher amps for this Led seems to help

polarweis
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Yokiamy wrote:
polarweis wrote:
Just now noticed that on the second mode the sft40 very slighlty flickers. third and forth modes are normal.

Yep, my KR1 does that too!
Lowest ramp is now set to 15 clicks, where you can slightly see it flicker, but it seems to be almost as low as possible current.
Running higher amps for this Led seems to help

I just put another sft40 into m21a which has same 6amp 4 mode driver. Worked perfect with sst40 and w2. With sft40 only higest mode and no switching between modes, so its like single mode light. It does not shut off like the s21a did on low mode.

"It wouldn’t be so bright if there wasn’t a shadow every once in a while." - Jason Mraz

polarweis
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Besides the strange behaviour I really like this led. Pretty crazy performance with c8 size reflector and 6 amps. Does anyone know a driver for convoy that works beter with this led, I do like my low modes too..

"It wouldn’t be so bright if there wasn’t a shadow every once in a while." - Jason Mraz

Verodin
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Does anyone have a SFT40 light from Convoy and Sofirn to compare? When comparing a Convoy S21A and Sofirn IF22A I noticed a big difference between the 2. Different greenishness (is that a word?) at low brightness, but also looks like a different temperature. As far a I know, there’s only 6500K available, so I’m having trouble placing the difference besides bin differences. Or could it be coming from the very different lenses?

JaredM
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Verodin wrote:
Does anyone have a SFT40 light from Convoy and Sofirn to compare? When comparing a Convoy S21A and Sofirn IF22A I noticed a big difference between the 2. Different greenishness (is that a word?) at low brightness, but also looks like a different temperature. As far a I know, there’s only 6500K available, so I’m having trouble placing the difference besides bin differences. Or could it be coming from the very different lenses?

Which one is greener and which one is cooler? Simon allegedly got a 5700K batch recently, but looking at the tint bin, it’s likely very green. So is the Convoy warmer and greener?

https://fundrazr.com/osturaband

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Verodin
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Didn’t want to influence the replies, but since you explicitly ask; Convoy is cold and clearly green at low brightness. Becomes cold white at full brightness. The Sofirn definitely has a more pleasant warmer beam. Need to do some comparisons with other lights to narrow it down, but I’ve got only 1 or 2 other 6000+ K flashlights with a known temperature. And they’re stashed somewhere upstairs, need to find those….

JaredM
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different drivers and optics will also contribute. If the Sofirn is a TIR and pwm FET driver, then it’ll have very different tint characteristics than a linear driver + reflector

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Verodin
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I know optics can influence it, but how much I don’t have a clue. But how would the driver influence the tint? Apologies if this is going slightly off topic, but that peeked my curiosity. I mean you basically have voltage and current. Assuming they are the same, you’d think the end result would be the same. So that would imply PWM affects it, but enough to result in a visible difference? Or am I misunderstanding it now?

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The difference is due to pwm’d output vs constant current. 10% on a pwm FET driver will have the same tint/cct as 100%, because its running the same instantaneous current, but its just off 90% of the time. 10% on a linear regulated driver will be running 10% current for 100% of the time. The latter is often preferred because it’s more efficient, but on emitters like these, it comes with the side effect of green low modes.

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Haukkeli
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Verodin wrote:
I know optics can influence it, but how much I don’t have a clue. But how would the driver influence the tint? Apologies if this is going slightly off topic, but that peeked my curiosity. I mean you basically have voltage and current. Assuming they are the same, you’d think the end result would be the same. So that would imply PWM affects it, but enough to result in a visible difference? Or am I misunderstanding it now?

Fet driver uses PWM. So it gives short pulses of high current. That way average power level stays lower. Because of high current in those short bursts tint resembles tint of running other types of drivers in higher modes.
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Learned something new today, thanks (to both of you) for explaining so clearly Big Smile

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JaredM wrote:
Verodin wrote:
Does anyone have a SFT40 light from Convoy and Sofirn to compare? When comparing a Convoy S21A and Sofirn IF22A I noticed a big difference between the 2. Different greenishness (is that a word?) at low brightness, but also looks like a different temperature. As far a I know, there’s only 6500K available, so I’m having trouble placing the difference besides bin differences. Or could it be coming from the very different lenses?

Which one is greener and which one is cooler? Simon allegedly got a 5700K batch recently, but looking at the tint bin, it’s likely very green. So is the Convoy warmer and greener?

Convoy is definitely warmer and greener I have been replacing the SFT40 in the convoys with ones from kaidomain that are way cooler 6500k side by side there is a big difference

Verodin
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Interesting to read multiple persons report the Convoy one is warmer. Here it’s the opposite. I’ve also found that the color of the hotspot/spill ‘transition’ has a big effect on how the coldness/warmness is perceived.

It’s hard to get it to show correctly in a photo (screen can also make a big difference), but here they are next to each other shining on a white ceiling. Convoy left, Sofirn right. 1st photo full brightness, camera on auto. 2nd photo camera on manual to show it better.


Edit: just noticed on my phone that the Sofirn looks way greener than it is in reality. It’s not that bad at all.

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Let me explain the convoy SFT-40 emitters on mcpcb not in the lights that they sell now are 5700k stated from Simon idk if they are just what he got or if they sell other kelvin ones but that is what I was sent I was curious since the ones I got from kaidomain seamed cooler so I asked

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Aha, that explains why the Convoy one is so cold (at full brightness). So he’s been using at least 2 different batches.

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JaredM wrote:
I wonder if a thin application of LED Seal to these SFTs while still in the reel would solve this issue.

My experience with cleaning sft40-

i have found that every time I reflow a sft40 (has happened over 2 dozen times now since last summer), that i pay special attention to the LES the first couple of times turning the light on. Especially after the first 1-2 times turning the light up to TOR, and I never turn it onto turbo right after installing it. 

if or when the black spots appear on the LES after install, I remove the lense and reflector and I clean with qTip and isopropyl alcohol throroughly, and the black will be removed. And it almost never comes back.

 

i have found that you can scrub these leds very rigidly with a qTip, if it is needed, to remove the black spots, without negative effects to the led.

 

the only sft40 I have ruined with black spots on the LES are the ones I hadn't realized I neeDed to watch after installing, I didn't clean with alcohol after installing, and I ran high amps after installing without taking notice of any spots on the LES first. 

[FLF] Five Light Friday https://budgetlightforum.com/node/78749

Check out some of my new lights (picture heavy) and quick first impressions of them here: https://budgetlightforum.com/node/77180

My Sft40 beamshots / comparison thread: https://budgetlightforum.com/node/78100

The BLF GT with SFT40 (2300lm, 2700m+ @ 30 seconds!)
https://budgetlightforum.com/node/79561

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I wonder if anyone knows a place to buy good (not green bins) of sft40?

 

the original release from Simon this past summer were fantastic. They were not green at all and very bright. I still have 3 or so lights with one of the original released sft40 in them. 

all of the ones I have bought since from Simon (he is the only place I have bought them so far) have been varying amounts of green, at lower levels to about 3-4amps of current. 

they "whiten" up after about 3-4amps of current, but still aren't as bright as the "less or no green" tint Bins that used to be available.

 

anyone find a seller who has had nicely tinted sft40 recently? Thank you.

 

[FLF] Five Light Friday https://budgetlightforum.com/node/78749

Check out some of my new lights (picture heavy) and quick first impressions of them here: https://budgetlightforum.com/node/77180

My Sft40 beamshots / comparison thread: https://budgetlightforum.com/node/78100

The BLF GT with SFT40 (2300lm, 2700m+ @ 30 seconds!)
https://budgetlightforum.com/node/79561

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ArtieT59 wrote:

I wonder if anyone knows a place to buy good (not green bins) of sft40?

 

the original release from Simon this past summer were fantastic. They were not green at all and very bright. I still have 3 or so lights with one of the original released sft40 in them. 

all of the ones I have bought since from Simon (he is the only place I have bought them so far) have been varying amounts of green, at lower levels to about 3-4amps of current. 

they “whiten” up after about 3-4amps of current, but still aren’t as bright as the “less or no green” tint Bins that used to be available.

 

anyone find a seller who has had nicely tinted sft40 recently? Thank you.

 

Kaidomain has nice very cool SFT-40 6500K they are the whitest and brightest I’ve seen

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Just looked again
convoy SFT-40 are N5 CE 5700k
Kaidomain SFT-40 are N5 BC 6500K and might be a better voltage bin looks like the same ones convoy originally had before the switch

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