Luminus SFT40 test

AFAIK SST-40 is 5050 footprint, and the “40” refers to the die area. Just like SST- 20 are 3535 and SST-10 are certainly not 1010 pad (couldn’t tell you what their actual pad size is though!)

Yes, SST40 are a 5050 footprint so they won't work on a 4040 MCPCB. Very few LEDs have a 4040 footprint.

And the SST10 LEDs are a 3535 footprint same as the SST20 AFAIK.

To add to further confusion SFT40 / SST40 / SST70 / SFT70 have 5050 footprint and SFT20 has an entirely different footprint from SST20.

http://kaidomain.com/Luminus-SFT-40-White-6500K-LED-Emitter

KD has them…

Fixed link. Interesting it's the same bin info N5 BC but doesn't list the full part # with voltage level spec (VJ, etc.).

When you try to buy one led it says item not available

But they are in stock (as long as no one orders them).

Finally got a chance to try one of these out, pre-mounted on a 20 mm from Convoy. I modded a Nitenumen TK-35 a while back with a SST-40 5000K and FET+1 driver. Figured I'll swap the LED in this one so got a more or less apples-to-apples comparison.

Wow this LED is impressive! Not a fan of the tint, but the numbers don't lie.

The TK-35 has a 53 mm diameter head. Lumens taken at start and 30 secs - maukka calibrated #'s, throw taken at 5 meters:

SST-40 5000K, VTC5D: 8.5 amps, 2060-1840 lumens, 141 kcd

SFT-40 6500K, 30Q: 8.35 amps, 2430-2220 lumens, 313 kcd

It doesn't even look well focused, not a well defined hot spot, messy corona. But the throw #'s are pretty crazy. I'd have to check how a Boost HX compares to this thing.

Impressive numbers, Tom.

Looks like Simon has SFT40 back in stock

The more I play with it, guess the tint isn't so bad for CW. 5000K is about the coolest I go, lately preferring 3000K-4000K. The beam tint is rock solid consistent at least, and don't see green at all, maybe a bit blue compared to my other warmer tint lights, but only more noticeably blue at higher amps.

Would love to hear other tested results. Haven't seen much posted, and Simon rarely included throw specs on his lights, and his lights are all "amp limited", not that it's a bad thing but we are not seeing the full potential of the LED, as djozz's test shows. 8-9 amps seems like the sweet spot for this one.

is there any opportunity to get sft40 below 6500k

like 5000k?

i would like to send link to fenix, as i am not happy with sft40 model they sent to me. tint is total greenish and crappy

Not that I know of. Only trusted source I know of is Simon, and all he has is the 6500K.

thanx,anyway. strange, as once that is dedomed sst40, this led should have 5000k option. i like its perfprmance, so, i hope, sst40 5000k should be way more attractive from the staindpoint of tint and overall throw usability

It's a different design from a SST-40, as djozz explained in the OP. Definitely not a straight re-packaged, de-domed SST-40. Looks like a new generation and the resulting output proves that. If the manufacturer dedomes (XPL-HI), or you manually dedome, you always lose a fair amount of lumens but this SFT-40 holds it's own with a SST-40 domed, and in fact handles higher amps better.

Agree though - I'd love to see this in 5000K, or warmer. I wouldn't hold your breath over a 5000K version. Look at freeme's group buy thread on a FT03 w/SFT-40 started in 2019 -- still not available!

hm, thanx for details..i thought that it is nothing but dedomed sst40

In a Palight BOSS1:

Close up view:

It hit 990 kcd in the 100 mm head diam BOSS1 on a single GOLISI 26650. This BOSS1 is direct wired, no driver.

Lumens on 4 old EFEST 4200 mAh 26650's: 2640 at start, 2315 at 15 secs (maukka calibrated). On my old lumens standard, it's: 2965-2600 ! Wow!

Best #'s I've seen from a single dye 5050 LED, and not bad tint shifts in the beam (ex: multi-dye XHP50.2 3v).

Thinking about opening my Q8 once again. This seems to be a convincing LED. If only the CCT were a little lower :weary: .

I’m waiting for the 50.3s to swap into my EC03. We’ll have a 50.3 HI if you want some more throw

It sounds like the luminance of the SFT40 is similar (but not better!) than the SBT90.2 . Think twice before swapping it into the WT90, you win runtime but maybe not throw.

Yea, thinking it's a draw at best for throw. Hard to do apples-to-apples compare with variables such as the reflector, focusing, etc. I'm sure a reflector that's good for a SBT90.2 is not always the best for a Boost HX, etc...

The more I think about it, probably the best comparison is in an aspheric, and I got a couple with SBT90.2's, the 1504 for example, with swappable pills.