Imported from r/flashlight, I believe by our very own @TUIG101!
https://www.reddit.com/r/flashlight/comments/1khhygk/psa_new_interesting_releases_from_luminus/
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Hm, I am not so impressed. The flip chip variants are like LH351D, 519A and HL2X, so just another standard flip chip domed emitter on the market, so these are not interesting. The cool white high CRI SST-20 are the most interesting ones since the cyan gap is not as pronounced as for many other high CRI emitters, but I expect greenish tints, because of the spectrum - fixing the cyan gap brings a lot of green into the spectrum, and the red phosphor seems to be too little to compensate that.
Also we will have to wait if the heavy tint shift Luminus is well known for occurs.
Since it is Luminus, we have to wait for consistent zero duv tints in general. In the moment the tints of Luminus LEDs are hit or miss, except the warm white ones.
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Agree with your assessment. Looking at the spectrum, the 90CRI 5000/5700K of the SST20 will have sub-50 R9, and cyan gap doesnāt seem better than the 519A samples you tested.
Iām personally most interested in the 5050 SFT12 (hoping for enough room for overdrive, as the datasheet specs are mediocre) and the 95CRI flip-chip SST20, which comes with a larger die than before and could compete against the 519A due to better cyan, at the expense of some output.
Luminus hasnāt released a āniceā high cri led since the sst20 back in 2017-2018 and itās hard to beat the OG sst20 in 4000k 95 cri. The 5000k and 6500k variants are so green at low outputs and woth the sft25r, if you dont need high cri or warm tints, itās pointless to install one. Hopefully the 5050 size sft12r can be a competitive led, but it looks like another round die 5050 size led with a smaller LES.
Itās funny how strongly opinions differ. I have gradually replaced the SST-20 4000 K high CRI in my lamps with Nichias because of the tintshift (at low currents ALL my samples were slightly green, and 4000 K is a CCT where this is extremely noticeable, at least to me).
For me, the only really good high CRI LED from Luminus is the 3000 K 95 CRI (SFT-40, SFT-70). But of course there can also be yellowish tints in circulation. Itās always a snapshot as far as the tints are concerned.
Since I am not really interested in low CRI thrower LEDs in general, I am not really interested in this SFT-12. Maybe it has slightly better performance, but more important would be that Luminus has finally fixed the ugly tintshift with increasing operating current. A few SFT-25R have a new phosphor with much less tint shift.
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Which CCT of SFT25R did you get the new phosphor? My biggest problem with this emitter is uneven phosphor distribution in 5000K (dark center), followed by high Vf that makes full output impossible for almost every 18650.
The 3000K SFT40 is really something else. I had a 3000K SST20 for a side-by-side, and the SFT40 has noticeably better color rendering: cyans and red are well-contrasted, and nothing looks pale. Without a side-by-side comparison, I could not tell the difference between a SFT40 3000K and a halogen spectrum. For every other blue-pumped LED Iāve tried, including 519A, the difference is obvious without comparison.
Itās funnyā¦the only āniceā sst20 i have are two Fireflies pl47G2s (with some really nice sst20s), calibration light and a fwaa with really nice sst20s. The rest, are pretty bad, low cri. While the 519a beats it in overall tint and color rendering out of tirs and reflectors (plus a bit higher output as a single LED), the super nice ones arenāt too green and have nice warm tints. Plus more candela/intensity.
Was cool white, around 6200 K or so.
These SFT-25R are the ones in my Ledlenser V2 Neo project (12th OL challenge) from Kaidomain, supposedly highest bin.
The low CRI ones have the worst tint I have ever seen in my life. The absolute worst one was a cool white SST-20 with duv over 0.02 (!) in a friends Fenix light. Unfortunately I donāt have a spectrum of this LED and my friend cannot find his Fenix light again, but maybe this is for the better 
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My FF E07 had the best SST20 4000K Iāve ever seen.
Iāve only seen 1 other SST20 4000K come close.
Yah somehow Jack was able to source a reel of some exceptionally nice ones from luminus. Iāll never get rid of those ones because theyāre so nice. The ones in the PL47 Mu come close to the E21A in the NOV-Mu for overall beam quality.
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I have an E09R thatās really green. I also have a MF01 Mini 6500k thatās really green.
The SFT25R may secretly exist already in 5050 footprint. This review is highly suggestive of such an emitter:
I am currently testing the LED of the Brinyte ZT40.
I am pretty sure that this is NOT the Luminus SFT-25R in a 5050 package.
The LES is bigger as for SFT-25R (different LED chip is very likely used, this unknown emitter has 1.8 mm diameter LES, the SFT-25R only 1.7mm), the pattern of the bonding wires is different. Another thing that stands out: the LED chip is embedded too deeply in the frame. Light emitted from the side is reflected back from the silver frame, which reduces the luminance. The SFT-25R has not done this.
More to this in the next days.
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I thought it was definitely a Luminus emitter, and possibly a 5050 version of the SFT25R, because
(1) The characteristic metal frame around the emitter, and
(2) The bonding wire pattern (all 4 wires oriented in the same direction) coincides with that of SFT40.
(3) EDIT: forgot to mention that Brinyte markets the LED as SFT25R.
The difference in die size is interesting. Iām looking forward to your test, and hoping to see marginally more intensity and significantly lower forward voltage, while maintaining decent tint.
This unknown emitter has much lower Vf as SFT-25R (3.3 V at around 5 Amps), the characteristics of this chip are different. The thermal resistance is lower, the maximum is at around 11 A. For comparison: SFT-25R test (F6 bin)
If this emitter is made by Luminus, then they use a different chip, a different design and another phosphor mixture. This unknown LED has almost no tintshift.
But the fact that they are using a different chip for an LED in the same series makes no sense, especially as the SFT-25R has not been on the market for very long and the chip will certainly not be replaced by a newer revision with different characteristics.
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This sounds like a substantial upgrade over the SFT25R, and the 11A max approaches that of the SFT40. I agree that it would be very strange to change so much, so soon. Perhaps another manufacturer is collaborating with Luminus and outsourcing the LED package to them, while using their own chip.
I wonder why Brinyte claims this emitter to be the SFT25R?
Where did they claim this? In the German shop they just call it āCREE white LEDā (no joke)
(Makes also no sense btw since these round-die Cree ones are designed completely different)
If it really is an SFT-25R, it would just be silly to use a different LED chip that is definitely slightly different since they already have the chip used in the 3535 variant.
I could be wrong of course, but with the method of counting pixels I actually come up with different sized LES. The easiest way would be to play with open cards and publish what exact kind of LED is inside. After all, an SFT-25R with 5050 hasnāt even been officially announced yet, not even through Chinese channels as is sometimes the case, so why would Brinyte happen to have received a batch of these unannounced LEDs which are completely unknown to this date? Surely they are not installing pre-production samples in mass-production lights?
The SFT-40 maxes out at around 14 Amps btw. This is to be expected since they have a much bigger chip with much bigger thermal heat sink.
This is the site I saw, and hereās a screenshot:
Calling it āCree white LEDā is rather irresponsible on their part.
I trust your method of pixel counting, perhaps you could double-check whether the die is different by looking at the density and arrangement of vias (the dots visible through the phosphor). A different number or arrangement would be conclusive evidence for a different die.
To be frank, Iām kind of used to random small-batch LEDs floating around without any sort of official documentation. The SFT40 4000K was a prime example, and now thereās this.
I would not be surprised also if this LED is a joint production between LMP and Luminus. The W7070ST1 has a metal frame in the same style as Luminus emitters, and looks very much like a bigger version of the emitter in question, save for the gold-colored frame and the square corners around the die.
Why Luminus? Luminusās parent company Sanan has been selling various round chips, and Latticepower also has similar products. And many LED packaging manufacturersā products are very similar to Luminusās packaging.
Good point, I forgot that Luminus is owned by this much bigger company that also collaborates with other sub-companies. Itās hard to not think of Luminus, however, when the Brinyte website advertises the LED as āSFT25Rā, though now the mismatching info from the German website suggests that the advertised info is not to be believed.
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