Sofirn C8F host. 21700 C8F Available

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ZozzV6
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Brainsick67 wrote:
Hmmmm..how do u check the amps?

Another light but you get the idea.

Brainsick67
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Thanks..but doesnt help me..no offence..but not good at this..lop..i just have mine set at Voltage..

I'm ThatCrazyFlashaholic 67

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Brainsick67 wrote:
Thanks..but doesnt help me..no offence..but not good at this..lop..i just have mine set at Voltage..

Show a pic of your multimeter and I will tell how to set it and use very short leads.
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Im insure how..never uploaded photo on here. Keeps asking for URL

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shirnask
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Brainsick67 wrote:
Im insure how..never uploaded photo on here. Keeps asking for URL

Open an account at Imgur and post your pics there and link them

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ZozzV6 wrote:
Mine with the stock Sofirn battery made 3100 lumens. I also noticed that it is creeping up. And mine draws 8,5A
I ope Sofirn take a look at the drivers. I told them there are some issues.

What did you get for IR on the Sofirn supplied battery Zozz?

KB1428 “Live Life WOT

JasonWW
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Brainsick67 wrote:
Thanks..but doesnt help me..no offence..but not good at this..lop..i just have mine set at Voltage..

Do you have a clamp meter?
ZozzV6
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KawiBoy1428 wrote:
ZozzV6 wrote:
Mine with the stock Sofirn battery made 3100 lumens. I also noticed that it is creeping up. And mine draws 8,5A
I ope Sofirn take a look at the drivers. I told them there are some issues.

What did you get for IR on the Sofirn supplied battery Zozz?

I need to check but if I remember correct it was around 40 mOhms
Brainsick67
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ZozzV6 wrote:
Brainsick67 wrote:
Thanks..but doesnt help me..no offence..but not good at this..lop..i just have mine set at Voltage..

Show a pic of your multimeter and I will tell how to set it and use very short leads.
This one. http://imgur.com/4TcGrXL

I'm ThatCrazyFlashaholic 67

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Brainsick67 wrote:
This one. http://imgur.com/4TcGrXL

turn the switch to the 10A position. 180° from this. And plug the red wire to the empty hole next to 10A position. Put the red probe to tube edge and the black to battery and then turn the flashlight into turbo and read the numbers.
BTW with long wires you will reading low numbers because at over 4-5A the wires act as a resistance in the circuit. So the best way to measure high power flashlights is a clamp meter.
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Ok thanks..i prob wont do it then.

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LEDtec
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I replaced the original MCPCB of my C8F 21700, with one I had purchased a few months ago from Sofirn on which I put 3x XP-L2 (UU640H) ,
Now I get almost 3300 lumens(@CRI90) , and almost 13A at the tailcap.

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

with the sofirn 21700 battery, I measured about 2,900 lumens

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

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Brainsick67 wrote:
ZozzV6 wrote:
Brainsick67 wrote:
Thanks..but doesnt help me..no offence..but not good at this..lop..i just have mine set at Voltage..

Show a pic of your multimeter and I will tell how to set it and use very short leads.

This one.


If you are interested in measuring amp loads I would recommend a meter like the UNI-T UT210E for about $25-$30. Measuring the amp draw is a good way for people to compare outputs.

Nowadays we have homemade lumen tubes and integrating spheres to measure actual lumens.

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JasonWW wrote:
If you are interested in measuring amp loads I would recommend a meter like the UNI-T UT210E for about $25-$30.

Where you see ‘em for that little? Amazon has ‘em for 45, AX same, GB 54(!), nothing below 40.

I was meaning to get a clampmeter that could handle DCA, and this one seems to be pretty popular here, so…

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Lightbringer wrote:
Where you see ‘em for that little? Amazon has ‘em for 45, AX same, GB 54(!), nothing below 40.

I was meaning to get a clampmeter that could handle DCA, and this one seems to be pretty popular here, so…


M4DM4X has coupon code for it from banggood.
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Kewl, tnx!

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We love it! Beer

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We can use that debit card in Brainsick’s picture to buy new clamp meters for everyone. 12345678900000

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KawiBoy1428 wrote:
What did you get for IR on the Sofirn supplied battery Zozz?

I checked the IR in a miboxxer C8 and in an Opus BT-C100.
The C8 measured 34 mOhms and the Opus measured 23 mOhms.
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ZozzV6 wrote:
KawiBoy1428 wrote:
What did you get for IR on the Sofirn supplied battery Zozz?

I checked the IR in a miboxxer C8 and in an Opus BT-C100.
The C8 measured 34 mOhms and the Opus measured 23 mOhms.

Thanks Zozz, my SKY RC3000 measured 24 mOhms.

KB1428 “Live Life WOT

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KawiBoy1428 wrote:
ZozzV6 wrote:
KawiBoy1428 wrote:
What did you get for IR on the Sofirn supplied battery Zozz?
I checked the IR in a miboxxer C8 and in an Opus BT-C100. The C8 measured 34 mOhms and the Opus measured 23 mOhms.
Thanks Zozz, my SKY RC3000 measured 24 mOhms.

This is my result (lowest IR achieved after rotating the batteries and pressing the batt-IR check several times)

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Another thing I love about my Sofirn C8F 21700 is that it can run the cheap Tuofeng 18650 2600 mAh and still be very bright. The brightness with the Tuofeng batteries still reminds me of the Olight SR90 in terms of lighting up a room brightness.

Sofirn is number one for me. Cash Solid budgetlight. Above and beyond. Thumbs Up

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I had a chance to compare the Sanyo UR18650NSX 2600mAh against the LG MJ1 3500 mAh. The runtime is definitely solidly longer with the LG. This means that if I want long runtime at a good brightness level in my Sofirn C8F 21700 torch, I should purchase the Samsung 50E 5000 mAh battery which is currently $9.95 from Battery Junction or $9.99 from IMR Batteries.

Hope this observation helps.

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the4ds9 wrote:
I had a chance to compare the Sanyo UR18650NSX 2600mAh against the LG MJ1 3500 mAh. The runtime is definitely solidly longer with the LG. This means that if I want long runtime at a good brightness level in my Sofirn C8F 21700 torch, I should purchase the Samsung 50E 5000 mAh battery which is currently $9.95 from Battery Junction or $9.99 from IMR Batteries.

Hope this observation helps.


Ah, it’s good to see the 50E is now being sold at more places. Other good high capacity 21700 are LG M50 and Samsung 48G (the 50E is designed to replace the 48G).
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Thank you for making me feel like part of the group. Flashlight prices are out of control. Back in 2011, you could pay $334 to Amazon and have a pristine Olight SR90 in top quality casing delivered to your door guaranteed. The thing was 2200 lumens and most importantly over 100k cd throw, with long sustained runtime because of the 8 × 18650.

Sofirn is the only cutting edge LED torch technology that I can afford. I don’t think I could pay more than $300 and change for the biggest and baddest but that is what they are nowadays $500+. Plus they are not sold on Amazon, but Sofirn is sold on Amazon. God bless Sofirn. Thank God for BLF.

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the4ds9 wrote:
Thank you for making me feel like part of the group. Flashlight prices are out of control. Back in 2011, you could pay $334 to Amazon and have a pristine Olight SR90 in top quality casing delivered to your door guaranteed. The thing was 2200 lumens and most importantly over 100k cd throw, with long sustained runtime because of the 8 × 18650.

Sofirn is the only cutting edge LED torch technology that I can afford. I don’t think I could pay more than $300 and change for the biggest and baddest but that is what they are nowadays $500+. Plus they are not sold on Amazon, but Sofirn is sold on Amazon. God bless Sofirn. Thank God for BLF.


I would say flashlight prices are falling left and right. New leds and new batteries are giving better performance for a fraction of the price compared to a few years ago.

The BLF GT is 1800 lumen and 1,200,000 cd throw and sold for either $120 or $160 depending on the group buy.

The GT70 is like 7500 lumen and about 600kcd and $220. Both are 8 × 18650.

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That’s a nice thought Jason, brace yourself for the new wave of technology and it’s inflated price margin… Wink

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DB Custom wrote:
That’s a nice thought Jason, brace yourself for the new wave of technology and it’s inflated price margin… Wink

If it’s worth it, people will buy it. If not, it will sit in a warehouse.

Give me an example of what your talking about. Do you mean the laser excited phosphor mini throwers or something else?

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Thanks for bringing the BLF GT70 to my attention. I may take a risk and try it out, based on the numbers on paper and design. In the meantime, I will keep using my Sofirn C8F 21700. Beer

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