What light is that with the Red LEDs?
This one:
Also available in 18350, but not in blue:
Same drivers, normal modes: Lo, mid1, mid2, high
hidden: turbo, strobe, SOS, red light and red blinky
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I’ve had a Speras M4 for a while- it doesn’t get used much. The stock LED is a Yinding 5050 (or it looks identical) and a horrid green colour at low levels. It’s got a good throw for the size, but for general use you need to have it turned up to get any spill e.g. walking in the dark. I was going to swap a SFT25R in, but when I pulled it apart I discovered a custom MCPCB that is larger than 20mm diameter and has three locating lugs for the TIR.
So that plan was scrapped as there’s no way to fit a 3535. I looked online and noticed the latest model has an SFT40 fitted- so I used the stock MCPCB and put an SFT40 onto it. Stock, they have the short body and use a protected 18350 battery- with warnings to only use protected cells etc. I’ve got the optional extension tube to enable 18650 use, so after doing the emitter swap I fitted the extension and charged up a (unprotected) VTC6 18650.
The output is way better than I expected. I measured the tail cap amps on turbo and it’s getting to over 8 Amps! Needless to say it works rather well now and also has some useful spill to the beam at lower levels.
If you’ve got the original Yinding version it’s a mod worth doing. BTW I used some double sided tape to get the “stuck” TIR out. It looks like they glue the legs into the MCPCB.
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I had a convoy S21A triple with an LD-B4 driver that I never really used as I didn’t like the luxeon V emitters in it (though they did make lot of light!). I was going to order some CULPM1 emitters for it as it had a 4040 MCPCB but they are pretty expensive! So instead I dug out one of my last 3x 3535 Led4power MosX boards with the FET & NTC attached, reflowed some old gen 1 XPL-HI 4000k emitters from kaidomain and put it all back together. Now I love it! Its got a lovely rosy tint, though the low cri does make wood & skin look a little odd.
A side note: I love the “LD-B4” solder mask markings on the solder pad for the spring, the solder avoids it leaving some very cool text swimming in the solder.
(Yes I cleaned the flux after these pics, no solder joints were harmed in the making of this 
)
P.S. Anyone know if the Fireflies 4000K 3535 domeless emitters can be FET driven? I’m tempted to try and fix that low CRI…
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Some of my favorite 4000K emitters!
Rip L4P 
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Pre-covid my flashaolic friend order from Hank a KR4 TiCu coloured with XPL-HI 4000 or 4500… they had the same tint of SW45. For me one the best emitter on the planet.
Very neutral without green and rosy tint.
When I order my first D4V2 with the same emitter Hank send me the new batch…
I do a lot of research of those XPL but I never found it in any way.