SFT40 Emitter - What's so great about it?

16 posts / 0 new
Last post
CollectEverything
CollectEverything's picture
Offline
Last seen: 16 hours 28 min ago
Joined: 07/17/2021 - 00:19
Posts: 545
Location: USA
SFT40 Emitter - What's so great about it?

Honest question, why is this emitter getting so much buzz? What makes in unique? I’m interested in learning more about it.

------------------------------------------------------------------------------------------------------------------------------------------------------------
Collection: TN42, TN40S, Catapult V6, SP36 BLF, sc700d, sc64c LE, D4V2 CuZn, D4V2 CuTi, D4V2 Al x2, KR4 Al x2
------------------------------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------------------------------------
Wishlist: Acebeam K75, Zebralight sc600w mk IV plus, Convoy M3-C
------------------------------------------------------------------------------------------------------------------------------------------------------------

CollectEverything
CollectEverything's picture
Offline
Last seen: 16 hours 28 min ago
Joined: 07/17/2021 - 00:19
Posts: 545
Location: USA

story wrote:
I saved this in my notes. Credits to OP>

“They’re two different lines of LEDs from Luminus. The SST-20 is split into two lines: high CRI 4000K and below; standard CRI 5000K and above. It has an emitting area of 2 mm2 (hence the SST-20). This allows it to be rather throwy since that’s a pretty small area for the light to come from.
The SST-40 is closer to the standard CRI 5000K+ SST-20s. It has a larger emitter area (4 mm2 ), only available in CCTs greater than 5000K, and no high CRI options. The bigger size of SST-40 allows it to produce much more lumens (more than a Cree XM-L2) and handle much larger currents. The beam hotspot size is also greater.
Superficially an SST-20 is like a Cree XP-G2 (or G3 depending on how bad the tint is) and an SST-40 is like a Cree XM-L2. Check out CRX’s guide on BLF.”


But I was asking about the S F T40

------------------------------------------------------------------------------------------------------------------------------------------------------------
Collection: TN42, TN40S, Catapult V6, SP36 BLF, sc700d, sc64c LE, D4V2 CuZn, D4V2 CuTi, D4V2 Al x2, KR4 Al x2
------------------------------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------------------------------------
Wishlist: Acebeam K75, Zebralight sc600w mk IV plus, Convoy M3-C
------------------------------------------------------------------------------------------------------------------------------------------------------------

everydaysurvivalgear
everydaysurvivalgear's picture
Offline
Last seen: 7 hours 45 min ago
Joined: 07/31/2015 - 10:25
Posts: 3764
Location: sydney australia (GMT+10)

Its a great LED nothing like it on the market, it has no direct competitors so it get praise. The praise is well deserved super bright yet has a good amount of throw, fits a standard MCPCB and you can use a standard centering ring. Unlike the XHP35HI you can direct replace the SFT-40 in any 3v light.

Luminus seem pretty happy to supply the portable LED market with LEDs we can actually use unlike other companies.

Also you can direct drive it and it will be safe, unless its in your pocket and it sets you on fire lol.

thefreeman
thefreeman's picture
Offline
Last seen: 4 hours 51 min ago
Joined: 01/06/2020 - 09:56
Posts: 1068
Location: France

See Djozz’s test

It’s a flat lens version of the SST-40, that is also upgraded, usually a flat lens versions lose about 10~15% compared to the domed version because light extraction is worse (there are less reflections back to the die with a dome, see CREE presentation about flat lenses ), from the test you can see there is no loss of lumens despite that and it takes a bit more current.
So it’s a powerfull, throwy LED, that is easy to drive like the SST-40 because it’s 3V.

JaredM
JaredM's picture
Offline
Last seen: 26 min 3 sec ago
Joined: 10/31/2011 - 13:33
Posts: 2593
Location: Pittsburgh, Pennsylvania

It’s a flat (domeless) emitter in a goldilocks size for compact flashlights that significantly outperforms anything in its class by a lot.

3V class, low Vf emitter capable of sustaining max output even on half drained li-ion cells

2500+ lumens from 4mm² in a common 5050 (xm-l, xhp50, etc) footprint

Overdriving safety margin that’s not common for emitters with bond wires. Aka robustness.

Smaller details – the symmetry and psuedo-roundness provided by the uncommon bond wire configuration that ‘clip’ the corners of the square die yields cleaner beam profiles (round corona instead of petals) than square or rectangular dies. And while minuscule, a [more] circular die will net more cd through parabolic reflectors vs a rectangle or say for theoretical reasons a star shaped die. The reason for this is as you light emission moves away from dead center, collimation efficiency decreases – aka it becomes out of focus.

TLDR : It’s a robust, high lumen + high throw emitter with good optical properties and is affordable and practical for use in compact flashlights.

https://fundrazr.com/osturaband

No affiliation, just a fan.

CollectEverything
CollectEverything's picture
Offline
Last seen: 16 hours 28 min ago
Joined: 07/17/2021 - 00:19
Posts: 545
Location: USA

Thanks everyone for all the good info. I didn’t realize that 3V was such an important spec. Which what are some lights that would be good candidates for swapping to the SFT40 emitter?

Does the SFT40 compete directly with the popular OSRAM W1 and W2 emitters?

------------------------------------------------------------------------------------------------------------------------------------------------------------
Collection: TN42, TN40S, Catapult V6, SP36 BLF, sc700d, sc64c LE, D4V2 CuZn, D4V2 CuTi, D4V2 Al x2, KR4 Al x2
------------------------------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------------------------------------
Wishlist: Acebeam K75, Zebralight sc600w mk IV plus, Convoy M3-C
------------------------------------------------------------------------------------------------------------------------------------------------------------

JaredM
JaredM's picture
Offline
Last seen: 26 min 3 sec ago
Joined: 10/31/2011 - 13:33
Posts: 2593
Location: Pittsburgh, Pennsylvania

3V is particularly relevant here due to its very high output (2600lm or so). Typically, once you get meaningfully above 2000 lumens, emitters are more and more likely to be 6 or 12v or use multiple chips. The only real exception that’s popular is the SBT90.2, but it’s problem is cost and that it requires way more power than most lights can maintain for more than 10s of seconds.

This emitter properly fills the gap between the W2 and 90.2, and is in the same realm when it comes to throw. W2 probably still edges out a win, and definitely it’ll fall short of a W1. On par with a 90.2 at 25A

https://fundrazr.com/osturaband

No affiliation, just a fan.

Lumeniac
Lumeniac's picture
Offline
Last seen: 11 hours 57 min ago
Joined: 12/19/2016 - 13:47
Posts: 831
Location: Russia

as a person, who used couple of sft40 models, incan confirm that is damn good in brightness and  throw.

 

but it has really serious CON - it is crappy greenish.

at least those pair that i tested.

 

if that is ok for u, u get impressive throw and briggtness

JaredM
JaredM's picture
Offline
Last seen: 26 min 3 sec ago
Joined: 10/31/2011 - 13:33
Posts: 2593
Location: Pittsburgh, Pennsylvania

Another reason so many of us are excited about this, is that unlike the old XML2, the SST40 was near impossible to fully dedome. So after many many years, there is finally a 4mm² LED truly domeless that could meaningfully outpace the original high amp XML2s. Yes, the XP-L HI did a fine job most of the time, but the Vf was high so it was hard to max them out in the real world.

https://fundrazr.com/osturaband

No affiliation, just a fan.

Unheard
Unheard's picture
Offline
Last seen: 21 min 51 sec ago
Joined: 01/16/2019 - 11:38
Posts: 2344
Location: Germany

Would it be of advantage in low-amp 16340-lights lights like Olights S1R*? They used to use XML2 and now, starting with the Baton 3, the SST-40 if I’m not mistaken. Also, the V11R could use a domeless LED.

Smile, you cannot kill them all.

Unheard
Unheard's picture
Offline
Last seen: 21 min 51 sec ago
Joined: 01/16/2019 - 11:38
Posts: 2344
Location: Germany

Lumeniac wrote:

but it has really serious CON – it is crappy greenish.


at least those pair that i tested.


Either there are heavy tint variations or I’m not sensitive: The one I have (Sofirn SP33V3) seems to be quite neutral.

Smile, you cannot kill them all.

Sirstinky
Offline
Last seen: 1 hour 5 min ago
Joined: 11/02/2018 - 17:07
Posts: 1437
Location: Vancouver, WA

This would do good in multi emitter lights sp36, EC03, maybe the ft02S, and definitely anything with an xhp50.2 3 volt

JaredM
JaredM's picture
Offline
Last seen: 26 min 3 sec ago
Joined: 10/31/2011 - 13:33
Posts: 2593
Location: Pittsburgh, Pennsylvania

I’m thinking Q8 Pro and C8F

Actually, I think its now time for 5050 mcpcb for the LEDIL ANGIE. In the end, something like an 26800 EA01S but a TIR quad.

https://fundrazr.com/osturaband

No affiliation, just a fan.

xevious
xevious's picture
Offline
Last seen: 18 hours 55 min ago
Joined: 02/27/2013 - 21:55
Posts: 2832
Location: Hoboken, NJ USA

Is this single-cell host compatibility series correct?

SFT-40 } Nichia 219C } XML-U2 } SSC-P4

Meaning if I have an old SSC-P4 3.6v flashlight, it could take an SFT-40?

Deluminator
Offline
Last seen: 6 hours 6 min ago
Joined: 05/20/2021 - 13:54
Posts: 86
Location: SoCal

It looks like Simon has the SFT40 back in stock. Based on sft40 flashlights are relisted again. Looks like he hasn’t updated his led section though.

Also the hype is well deserved! Just put one in my Convoy M1. It has a perfect Hotspot, there is zero Corona. I’m mean ZERO. this led will pull 11+amps with proper mnt fet driver.

M1 SFT40 MNT Fet vs M1 SST40 A6 driver, there is no comparison

logesearle
Offline
Last seen: 2 months 2 weeks ago
Joined: 09/24/2014 - 04:16
Posts: 95

I asked Simon about the SFT40 LED’s he was selling and he said that Luminus wouldn’t let him sell them outside of a torch for some reason