LED test / short review - Luminus SFT-25R-WG 5700 K 90 CRI

Flashlight Modding and DIY Parts LED Testing
1

Hello,

here is a quick look on the Luminus SFT-25R-WG 5700K 90 CRI.

No detailed test here since I had data loss despite backup which included most of the already written test.

For more details to this LED refer to SFT-25R low CRI variant.

Most notable difference is the outer frame previously made out of metal which was replaced by hard silicone/epoxy. most likely to reduce production cost. It is likely this will be the case for all future Luminus SFT emitters.

The LES is round and is exactly like the low CRI variant. The phosphor is different, and looks more orange.

Here is the comparison chart of the F35 by Skilhunt shown, the SFT-25R-WG is in this chart.

The spectrum has no surprises, although the CCT is very high with over 6500 K. The tint is very nice with duv -0.0001.
There is no heavy tint shift with higher operating current. The beam is also nice, like known from the low CRI SFT-25R variant.

Overall a pretty nice LED for everyone who needs a high CRI cool white LED. This should be also available soon on known wholesalers with known binnings.

Thanks for reading.

Best regards, Dominik

25 Thanks
【TS10V3 prototype】Should we continue with the TS10 series~
2

The power handling and efficacy seem excellent for this CRI class–it seems to max out at the same 8A current as the low CRI variant, just with -25% efficacy due to high CRI.

CRI looks just a tad worse (worse cyan dip and less red) than 519A 5700K (copied below from your test, for a side-by-side comparison), and the output is down -20% presumably due to the smaller and domeless LES. Still very good for a thrower though.

Interesting that your tests of high CCT high CRI emitters seem to consistently indicate higher-than-nominal CCT: your test of the 519A 5700K also ended up in the 6500K range, and the 6500K B35AM went above 7300K. I can imagine that a small change in color space makes a much bigger CCT difference in the high CCT regime, or that the blue spike perhaps introduces enough irregularity to mess with the computation.

6d88ac31fdc058e4ba0565be5d7f
6d88ac31fdc058e4ba0565be5d7f974×972 137 KB
5f9b0c44f4cf6c59e88047b979f1
5f9b0c44f4cf6c59e88047b979f1974×1009 138 KB

3 Thanks
3

Since I have no money to get a much better spectrometer, I cannot test this.

Especially the spectrometer helds me back so much in terms of analysing phosphor and testing other stuff with LEDs.

3 Thanks
4

Which spectrometer are you using?

5

It’s an i1 pro right? this shouldn’t be a problem, did you correct the integrated measurements in your sphere with an uniform light source like I mentionned some time ago?

6

Yes, it’s corrected. Big problem is the low resolution which makes detailed analysis of phosphor etc. impossible.

1 Thank
7

The hopoocolor HPCS310 has a 1nm resolution, it’s about 180€ when discounted (it was a few days ago for CNY, weird that it has already ended), but it’s still not exactly inexpensive.

In any case thank you for the test :+1:

8

Which seems to be smartphone only, which I don’t like. Want to have a standalone device. But thanks for the tip anyway

9

HPCS-330 is the standalone version, costs more though, I don’t remember exactly how much when discounted.

1 Thank
10

Can you compare the emitter height to the recent HT you tested (lookalike)?
I already asked you that in your post, but i guess you forgot about it.
Thx

11

I only have ugly green 5000K on hand so here it is

20260215_103619046
20260215_1036190461920×2560 343 KB

And beautiful slightly rosy HT35
20260215_103741460
20260215_1037414601920×2560 356 KB

This can be confirmed by looking at Luminus datasheet
Screenshot_20260215-105010~2
Screenshot_20260215-105010~21077×1859 39.5 KB

And searching the Hoptink on eg. Shoppyhub
O1CN01UHZHgD1raq5cWofuT_!!956765648-0-cib
O1CN01UHZHgD1raq5cWofuT_!!956765648-0-cib790×530 50.1 KB

1 Thank
12

I haven’t tested the HT35 yet.
I can compare height with F35R though. Since I am very busy at the moment I cannot fulfill every wish in time, sorry.

2 Thanks
13

Is there any real proof the HT35 from KD is manufactured by Hopthink?

15

We are talking about Chinese made obscure emitters, everything is possible in this regard :sweat_smile:

4 Thanks
17

I wrote email to Kaidomain, we will see what he answers.

18

I tried that before (for another obscure LED) and I got no answer from them whatsoever… hopefully they have some useful information and not only „its Chinese LED, see item description“

19

Yeap that’s it, SFT is “normal” height where HT(F) needs gasket trimming in order to get proper focus.thx

20

This focus discrepancy and need for sanding the gasket is also documented in this reddit thread.

21

thanks for the test results
I hope to buy a High CRI SFT-25 to use in a TS10SG

c1d4b155ca185de30b8a1f331e48b7752bf4673d_2_1332x1000
c1d4b155ca185de30b8a1f331e48b7752bf4673d_2_1332x10001332×1000 177 KB

1 Thank
22

Yeah, these are not listed on KD anymore… hopefully one day they will be available on wholesale with credible bins and datasheets.

1 Thank