Luminus SFT40 test

Nice convoy build. Ramping or buck? I wish I’d bought a non-atr sp35 when they existed too…

Thanks djozz for the test…

Received my M21C with SFT40. Agree with you that I see the same thing : “A bit, but acceptable, greenish at low current, ”neutral” cool white at higher currents”.

A huge thank you to djozz for the super informative test! :beer:

Any real world comparison between SST40 and SFT40 in Astrolux FT03? Is the boost in intensity and lumens noticeable?

I went with buck driver on S16.

Now i just remembered i have CPF Italia Cometa for upgrade too...

I do not have the SST40 numbers anymore (but others will have that?) but moreover, I lost the led centerpiece thingie so I assembled the FT03 without one and have now improper centering/ focusing. So once I find the centerpiece back in my hobby-mess I can do the assembly right and produce numbers.

In the meantime, with unperfect centering and focusing I measured current (Shockli 5500mAh at 4.10V) at 8.8A (about perfect) and throw at 396 kcd. I expect some improvement on this after correct assembly.

Great to see you back testing (even if it is just a one-off :slight_smile: ).

And thanks for showing me the SFT40 has advantages over my dedomed-by-KD SST40, i feel a D80v2 upgrade coming on.
This is one of those rare occasions my preference for a greener tint is of benefit :smiley:

And don’t quote me but from memory 396kcd is closer to FT03S territory than SST40 FT03.

Here’s a comparison between domeless LEDs that I have, also with it’s brother/Sst40.

I used S2+ hosts, AR lens, and Smoooth Reflector. All of the LEDs were centered. Driven at 20-ish mA.

1 Thank

That's a great comparison shot! Especially so since you minimized the variations by using the same host/reflector/current, and they're all close to the same color temp...excellent! I'd love to see the same shot at a longer distance if you have a large wall/building to use. Thanks for taking the time to do this.

Without a doubt agree. Would also much appreciate a slightly longed beam distance comparison picture!

Thanks for the test djozz. I appreciate the work. These look really good.

Thank you Djozz for testing this LED. I got one of Simon in the m21c, and i have more bare led's on the way. hoping they come in soon.

I noticed the tint was very pleasing for 6500k, white light more than green or blue or anything like that.

Question - i feel like this is the 3volt equivalent of the xhp35 (another favorite of mine), does it beat xhp35 / xhp35.2 in luminance?

Also - hopefully after CREE comes out with xhp50.3 in neutral tints, Luminus will see that and respond by making the SFT40 in 5000k, or maybe even 4000k. the SFT40 in 5000k/4000k would be unparalleled at this time!

Hey Tom, did you get yours yet? I ordered on June 12th, and looks like they just got to California, but jut wondering if anyone who ordered them that also lives within 200 miles of me (CT) received theres yet, or is it just me waiting on them?

Well, I was about to order a dozen osram cslpm1… I may now hold off for a dozen of these sft40’s… Very nice set of photos PeyoX. Thanks Djozz, glad to see you still like to test things to their limits!

yea, and the nicest thing is that the SFT40 is not that expensive either (when theyre in stock) they are probably the same price as a CSLNM1.

I wanted to do a 4 x emitter mod (astrolux EA01s) with the CULPM1 because it has the 4040 footprint so its an easy swap of LED's with the sst40 version of the EA01s, but (4) osram CULPM1 (in simon's store) are like $36+ shipped, and thats a normal price. I paid $26 for (5) SFT40's from Simon's store, and in my opinion the SFT40 is better (maybe doesn't throw as far, but there is more lumens, it can apparently handle more amps which is good for an FET driver like EA01s, and throw is close enough to the osram to still be impressive).



I ordered from Simon on June 17th and received them last Friday. The parcel got on the plane without a hitch this time but I've had a couple that waffled back and forth between airport and carriers over and over and over again until they finally found a flight (it can be maddening to monitor the tracking information while this is happening but it isn't uncommon). It's still luck of the draw right now as far as shipping is concerned, and you hope that some other parcel in your container doesn't get flagged and delay that entire container from getting on the plane. Lately USPS has taken as long or longer to get it to me once it's onshore as it did for the package to make it from seller to airline. I notice also that time varies greatly depending on which customs hub the package arrives at. Chicago and Florida seem to take ages, and double that if it ends up in Memphis or Phoenix on its next leg. Los Angeles and Texas seem to have it together.

Ohh, yes - received the pair mounted, and also received a separate order of 5 bare!

  • The pair of mounted ones were ordered June 8th, delivered July 6th.

  • The qty 5 were ordered June 30th, came in yesterday July 10th (10 days, near record time)

  • But the 3x21A (SFT-40's) ordered June 23th last updated July 3rd and appears on the way to the US.

Unfortunately I'm backed up a bit on modding, so haven't had a chance yet to try them. One will definitely go in a FT03. I got a bunch more lights (of course... ) to try them out in as well.

nice i cant wait to see what you do with them! ive changed my plan with them, not doing 4 in one light (ea01s) anymore, going to do 5 seperate lights instead. the ea01s is getting CULPM1 osrams instead

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.