Sofirn C8F host. 21700 C8F Available

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JasonWW
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Here is another light from Sofirn you may be it interested in, the SP70. Check the pictures on the last page for the latest info. Hopefully it will be available soon. It is like a smaller version of the GT70 and will be very affordable.

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the4ds9
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Yes I am interested. +1 Thumbs Up

JasonWW
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I finally recieved my 21700 C8F. The shipping took a lot longer than normal.

Driver and switch pics plus performance data is all here.
http://budgetlightforum.com/node/62876

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JasonWW
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BOMBAY wrote:
my c8f 21700 also has a brightness climb, but it does not bother me is a bit like HID

I also observed that the maximum power at the top of the ramp is a bit higher than the turbo with a double click


I notice the brightness climb as well.

I’ll have to compare the top of ramp with the dbl click.

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JasonWW
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JasonWW wrote:
BOMBAY wrote:

I also observed that the maximum power at the top of the ramp is a bit higher than the turbo with a double click

I’ll have to compare the top of ramp with the dbl click.

I get the same output for both.

Texas Ace Lumen Tube calibrated with Maukka lights

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ZozzV6
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I tested the low voltage indicator and protection of the C8F 21700.
The side switch lights for 5seconds when turn on the light or made any press like mode switching.
It glows green when battery is above 3,4V.
It blinks red when battery is from 3,1V to 3,4V.
It blinks red fast when battery is under 3,1V.
The light shuts off at 2,6V.

The indicator also start to glow when battery draining to another indication level.

BOMBAY
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JasonWW wrote:
JasonWW wrote:
BOMBAY wrote:
I also observed that the maximum power at the top of the ramp is a bit higher than the turbo with a double click
I’ll have to compare the top of ramp with the dbl click.
I get the same output for both.

Repetitively I get a bit different results, but the difference is not big and it’s about 3%

JasonWW
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ZozzV6 wrote:
I tested the low voltage indicator and protection of the C8F 21700.
The side switch lights for 5seconds when turn on the light or made any press like mode switching.
It glows green when battery is above 3,4V.
It blinks red when battery is from 3,1V to 3,4V.
It blinks red fast when battery is under 3,1V.
The light shuts off at 2,6V.

The indicator also start to glow when battery draining to another indication level.


Thanks for testing.

So there is no orange, just green and red, right?

Once the battery is below 3.4v the battery indicator stays blinking beyond 5 seconds, right?

This seems like a pretty nice design.

Texas Ace Lumen Tube calibrated with Maukka lights

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ZozzV6
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If it under 3,4v it blinks red for 5 sec without any action needed. And again turn off the switch indicator until switch pressed.

nkresho
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I got my light today. Brightness climb is totally out of control on mine.

Starts out at about 1000lm, then climbs to 1634 over the period of about a minute. Highest reading I could get.

Added 18 gauge leads from the driver to the mcpcb, and swapped the mosfet for an SIR800…

3,904 at startup with the sofirn battery.

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nkresho wrote:
I got my light today. Brightness climb is totally out of control on mine.

Starts out at about 1000lm, then climbs to 1634 over the period of about a minute. Highest reading I could get.

Added 18 gauge leads from the driver to the mcpcb, and swapped the mosfet for an SIR800…

3,904 at startup with the sofirn battery.


Yeah mine too, specially when you can visually see it. Does it still do the gradual climb in output now after you swapped the FET?? Sofirn battery is a very decent cell, prolly a IJOY? Well they match my abused IJOY’s anyways..

KB1428 “Live Life WOT

nkresho
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It climbs a little, but not the minutes it did before. Gets warm now too.

Double click it’s very apparent. Exactly like hid car headlights. Ramped to the top it wasn’t really noticeable before, but the meter just kept increasing. Like the was reading temp or something.

Battery is back on the charger. I’ll check it over time in the current configuration to see if it’s still climbing.

Got another of the same light inbound on the slow boat. It’ll be nice to compare the two. I grabbed this current light from Amazon. Way to go if you’re in the US. Three days.

JasonWW
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nkresho wrote:
I got my light today. Brightness climb is totally out of control on mine.

Starts out at about 1000lm, then climbs to 1634 over the period of about a minute. Highest reading I could get.

Added 18 gauge leads from the driver to the mcpcb, and swapped the mosfet for an SIR800…

3,904 at startup with the sofirn battery.


Wow, your low output and slow climb is really strange.

Mine climbs up over maybe 2 or 3 seconds and hits 2600 lumen.

Did you measure the tail cap amp draw after the upgrades?

The last time I talked to Sofirn they said their tests showed about 3500 lumen.

I wonder if they are testing production lights or prototypes? Maybe they got some low quality FETs that’s really reducing output. It doesn’t seem likely the led wires are causing such a huge difference in output.

Anyway, it’s nice to see the stock driver (modded) can put out big numbers. You retain the battery indicator function.

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nkresho
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Tested it after the fet and wire upgrade. Battery fresh of the charger.

 

|0 seconds|3920|

|15 seconds|3740|

|30 seconds|3600|

|45 seconds|3520|

|60 seconds|3480| 

 

12.4a at start on turbo.

 

Climb seems to be completely resolved.  

 

Ill check the next one too.

EasyB
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Regarding the climb, I wonder if the stock FET has a high turn on voltage. This would explain the low output. Then the high channel resistance would cause the FET to get hot, and I believe this causes the channel resistance to go down which would increase the output.

Sofirn
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Hey guys, sorry that C8F 21700 version has this issue. I was told it's caused by MOS component. I don't know what MOS is but I would love to send new driver to whose C8F max output lower than 3000 Lumens via 21700 battery. Please PM me.
JasonWW
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Sofirn wrote:
Hey guys, sorry that C8F 21700 version has this issue. I was told it’s caused by MOS component. I don’t know what MOS is but I would love to send new driver to whose C8F max output lower than 3000 Lumens via 21700 battery.

Please PM me.


This is what we were suspecting. The MOSFET or FET for short.

The big black component labeled 2D030L. I’m going to try out my hot air station and see if I can swap it out for a better one.

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SKV89
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Sofirn wrote:
Hey guys, sorry that C8F 21700 version has this issue. I was told it’s caused by MOS component. I don’t know what MOS is but I would love to send new driver to whose C8F max output lower than 3000 Lumens via 21700 battery.

Please PM me.

Sofirn, thanks for your excellent customer support as always! PM sent!

Satan@103TFS
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I just contact Cissy of Sofirn and she told me to send a new driver Thumbs Up Never disappoint with Sofirn service and fast respond ,looking forward for new Sofirn light Blushing

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same here thank you sofirn!

x-ray
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Sofirn wrote:
Hey guys, sorry that C8F 21700 version has this issue. I was told it’s caused by MOS component. I don’t know what MOS is but I would love to send new driver to whose C8F max output lower than 3000 Lumens via 21700 battery.

Please PM me.

Hi Sofirn

I want to purchase a C8F 21700 from Aliexpress but am now concerned about this defective driver issue.
Can you advise if their stock is being checked/replaced/fixed ?

Thanks

PBWilson
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Sofirn wrote:
Hey guys, sorry that C8F 21700 version has this issue. I was told it’s caused by MOS component. I don’t know what MOS is but I would love to send new driver to whose C8F max output lower than 3000 Lumens via 21700 battery.

Please PM me.

Wow! What great customer service.

nkresho
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I’m happy with swapping the fet myself, but I appreciate sofrin looking to address the issue nonetheless. That’s awesome, as usual from them.

Another point worth noting is that I’m really happy with the ramping on this light. It’s much smoother and a good speed. Compared to the sp32a v1, I feel this light has much improved ramping.

It’s pretty close to the d4. Not quite narsil, but very close imho.

PBWilson
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nkresho wrote:
I’m happy with swapping the fet myself, but I appreciate sofrin looking to address the issue nonetheless. That’s awesome, as usual from them.

Another point worth noting is that I’m really happy with the ramping on this light. It’s much smoother and a good speed. Compared to the sp32a v1, I feel this light has much improved ramping.

It’s pretty close to the d4. Not quite narsil, but very close imho.

It’s getting more and more rare for companies to listen to customer feedback. Sofirn seems to be doing it right.

contactcr
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So what can we do about this giant retaining ring? Think i can grind it down at an angle on the inside edge to fit a driver with 7135 on the bottom?

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contactcr wrote:
So what can we do about this giant retaining ring? Think i can grind it down at an angle on the inside edge to fit a driver with 7135 on the bottom?

Also mind the other side of the driver: the edge on which the driver rests is wide too and may touch driver traces and components.
contactcr
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I have a 20mm lexel driver so it might be ok on that side but this is a good point. Overly complicated driver shelf and Alu ring. Almost better to use 17mm and spacer

JasonWW
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contactcr wrote:
So what can we do about this giant retaining ring? Think i can grind it down at an angle on the inside edge to fit a driver with 7135 on the bottom?

Sure.

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Any suggestions for a 17mm constant current driver that works with an E-switch? I’m really interested in this host…

Astrolux SC01, BLF Q8, BLF A6, BLF FW3A, BLF FW3C, Convoy L2, Convoy L6, Convoy C8+ , Convoy S3, Convoy M21A, Convoy S11, Emisar D4, Fireflies E07, Jaxman E2L, Lumintop EDC18, Olight S1R Baton II special edition series, S2R Baton II, Nitecore HC65, Olight H1R Nova.

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contactcr wrote:
So what can we do about this giant retaining ring? Think i can grind it down at an angle on the inside edge to fit a driver with 7135 on the bottom?

Use fet+1×7135 driver with no parts on spring side.

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