Review and disassembly: Sofirn C8F

I am 99% sure they will come back to lifeā€¦
Probaj nemas sta da izgubis :beer:

So runtime is less than 30 mins on high? And only 13 kcd?

NikolaS
I will try :slight_smile:

blueb8llz
Thatā€™s what manual says. I have no way of measuring it.

The emitter board is said to be aluminium and heat transfer to the leds' thermal pad is thus also crippled. It would be wise to start measuring tailcap currents with less than fully charged batteries and work your way up from there to observe current ramp up as cell voltage is increased.

As it is, lower discharge cells may work better in this torch.

Cheers

You were right, reflow helped and leds are working good.

Only problem I have is it died again, but if I press on led with my finger it works when pressing.

I have to clean the board and replace solder and I think it will be ok. This time I only heated it as it was.

You welcome :sunglasses:

Just clean all remaining solder with copper wire after removing led, and some 1000 grit sandpaper will clean underneath led remains with just slight moving without any pressure. Applying good flux and quality solder will solve the problem for goodā€¦

NikolaS

I tried today several times and there is always at least one led not working good.
All of them are working now, but 2 are on only about 50% brightness.

Not gonna bother with it anymore.
I have asked Sofin for replacement MCPCB or I will somehow put 3 DTP boards in with XP-L HI.

Just ordered this light and three of these: http://kaidomain.com/p/S026300.Nichia-219C-Neutral-White-4000K-CRI92-LED-Emitter-with-KDLIGHT-3535-16-16mm-x-1_5mm-DTP-Copper-MCPCB
Since I have these LEDs as a triple in my S2+ and I am loving it, I hoipe to get a very nice High-CRI trower (i.e. more throw than that triple S2+ ;)) with this combination.

Sorry to hear that,hope you will end up with best solution. I have xpl-hi on the way, hopefully next week I will have a chance to test out that driver since Sofirn claims 4.5Amp and 1300+ lumens.
I will do a short review also

I am on the same boat, NikolaS. I am waiting for a C8T on its way in the slow boat.

Cheers :-)

Good thing it was free or I would be really mad :slight_smile:

Vf of LEDs in parallel doesnā€™t alter.

They donā€™t ā€œavalancheā€.

But if badly mis-matched, the lowest Vf one will take the majority current.

Or badly flowed onto a poor MCPCB, the one with the weakest thermal path will overheat soonest.

If one turns blue, it is getting far far too hot, and will never be quite the same again. DTP copper MCPCB is essential at these current levels, standard aluminium one hopeless, we learned this here years ago. It seems Sofirn have some catching up to do.

Yes I know the Vf of any given led doesn't changes because of parallel arrangement, Tom Tom. Leds in parallel will, however, share the load current, each one its own piece of the cake and thus their Vf only raises up to the corresponding shared current value (just ā…“ in this case for well matched emitters), which of course is going to be a lower value than that of most more poweful single emitters at the full current.

Cheers

PCB have big mass 30mmx1,5 and most obviously havenā€™t been heated properly resulting bad joints. At 6 Amp each led is taking 2 Amp which is not too much trouble for XP-G3 but results are more than badā€¦

If I get my version, I will make some makro-shots from the side of the LEDs (If I donā€™t forget thatā€¦) to see if they are sitting properly on the board.
2 Amps per LED really shouldnā€™t be a problem for the XP-G3 even on aluminium.

This C8 Host gives you many possibilities for 5 or 7 LEDs with TIR Lenses. Would love one of those.

I am right now a bit disappointed with my ThorFire TA13 (aka Sofirn SF30), the zoom mechanism isn't working smoothly and even gets stuck, it may have to do with me having to submerge the head a couple fingers in white spirit to unscrew the bezel for modding, though heck, that was weeks ago. Small rubber bits are coming out of the head, these for sure should be the inner o-rings getting @#$%. Grrr, is this OEM doing their research right?

Related: http://www.taschenlampen-forum.de/threads/sofirn-sf30a-modding-review-zoomtaschenlampe.57181/

Cheers

Please donā€™t keep on mentioning Thorfire. These are Sofirn. And it seems not great. They have gone their own way, seemingly without understanding first principles.

Whereas Thorfire are (IME) absolutely solid. Every one. Unless you know differently ? PS: dipping the head in white spirit is hardly a fair test, not at all surprised that you damaged some things trying that.

Thatā€™s all.

I'll soon be testing the C8T, Tom Tom, and I'm more or less sure it'll work right. The issues with the C8F are a combination of different emitters (XP-G3 vs XP-G2) plus an inadequate MCPCB, this latter latter being the most hurtful.

With regards to my TA13, for some reason at least one of the inner o-rings is becoming damaged and I don't know why yet. We'll see.

Cheers ^:)

Okay, I just got mine with the XP-G2s (or -G3s, whatever). Hmm, looks like the whole square is phosphor-coated, so -G3.

Anyway, wow! Nothing wrong with mine. So, nope, I ainā€™t gonna be taking it apart. :smiley:

Seriously, youse can dissect yours to your heartsā€™ content, but unless thereā€™s some pressing reason to do so, and risk shearing off any LEDs, I ainā€™t a-doing it.

Gotta admit, this is my first triple, and I was expecting 3 separate but overlapping beams, loads of artifacts, but this is nice. Looks like one tight beam for whatā€™d be 3 grouped 20mm reflectors.

Okay, due to the G3, I got the expected color-shift in the beam. Neutral hotspot, cool spill, strong yellow corona. Would G2s be a better choice?

Nicely lubed tailcap threads, buttery smooth, not scratchy at all. Nice firm click of the switch. Guessing itā€™s easily over 1000lm with a 30Q, via ceiling-bounce tests.

On high, it gets very warm, very fast, so it feels like thereā€™s a good thermal path in there. Anyone check for thermal goop? I forgot to look at earlier posts before writing thisā€¦

Anyway, Iā€™m suitably impressed. I was expecting a not-as-tight beam as a regular big-reflector C8, but this isā€¦ nice! Itā€™s kinda like a domed XM-L/-L2 in a C8. Quite a bigger hotspot than my XP-E2 C8, of course, but itā€™s still very usable. For more throw, Iā€™d stick with an XP-L HI (or extremely high-strung XP-Gwhatever), but as-is, this trip XP-G3 is quite good.

Best of all, the UI doesnā€™t piss me off. I almost cringed flipping it back to low, almost expecting the blink-on-low to switch 3/5 modegroups, butā€¦ nothing! Low, medium, high, yeah, doubleclick for strobe, but usable modes!

Damn, I canā€™t find a single thing wrong with it. :smiley:

(Well, okay, aside from the misbehaving G3s as far as color-shifts.)

If you donā€™t have a Nichia 219C flashlight yet - get them.
4000K or 5000K doesnā€™t matter, these LEDs produce such a nice light.
Just read through the MF-01 Group-Buy thread - all of the 219C owners are blown away from that beautiful light.

I will make this and put a BG FET+1 driver in it to power it