Help choosing 21700 battery for my Sofirn C8F

[hiuintahs]

@teacher

@Lightbringer

Yeah, I just bought the kits and use the come-with cells. They work just fine. No complaints.

I got the kit too & am pleased with the Sofirn also.

Using the Samsung 50E you’ll get a bit more run time but a little less output on Turbo.

Using the Samsung 30T you’ll get a bit less run time but a little more output on Turbo.

The Sofirn battery, as Lightbringer said…… “works just fine”. :+1:

Delta_V mentioned the Samsung 40T, I don’t have one of those; but as he said….it would be a good one. On par with the Samsung 30T, but 33% more runtime.

I got me a Samsung 50E in the mail today. I charged it up along with topping off the Sofirn battery. I checked in my makeshift lightbox, the lux figure for each battery. Naturally, I expected to see a slightly lower reading with the 50E at the turbo level……………which I did.

And I expected to see the same output at the lower levels regardless of what battery was installed………….but instead what I saw was a lower level with the 50E battery at all levels. At the low level (not the moon mode……just level one), I’m getting 410 lux in my light box (about 7 lumens) with the 50E. And I’m getting 660 lux (about 11.8 lumens) with the Sofirn battery.

So I’m wondering why that is? Evidently this light is not current regulated? I guess I can be OK with it as long as I get proportionally longer run time with the 50E compared to the Sofirn battery.

[hank]

Lordy lord lord, the reviews at Ali are sooooo helpful.

“If you compare with the batteries of samsung or lji of this format, then the elastic at these batteries less longer warms the speculated ”

Just what I needed to know.

[Dioda]

I have C8F in transit. Due to probably overrated “40A continuous” Sofirn 21700 cells I ordered Shockli 21700 4550mAh (purple). Should do 22A continuous and 30A pulse. For testing purposes I also went with one LiitoKala 4000mAh. Looking forward to do some measurements.

To be honest 21700 cells I dont like ordering at all, hate to play the “whats under the wrapper” game. Most of the OEM ones have rather pricey shipping for me.

[HKSJOSHUA]

I don’t know if it is to late of a post but I ordered 2 samsung 40t batts right after ordering a sofirn C8G

[patmurris]

@hiuintahs

I got me a Samsung 50E in the mail today. I charged it up along with topping off the Sofirn battery. I checked in my makeshift lightbox, the lux figure for each battery. Naturally, I expected to see a slightly lower reading with the 50E at the turbo level……………which I did.

And I expected to see the same output at the lower levels regardless of what battery was installed………….but instead what I saw was a lower level with the 50E battery at all levels. At the low level (not the moon mode……just level one), I’m getting 410 lux in my light box (about 7 lumens) with the 50E. And I’m getting 660 lux (about 11.8 lumens) with the Sofirn battery.

So I’m wondering why that is? Evidently this light is not current regulated? I guess I can be OK with it as long as I get proportionally longer run time with the 50E compared to the Sofirn battery.

At unregulated levels the driver uses PWM to modulate the output so it makes sense. When the leds are on they are at full power so they are brighter with a high current cell.

[YogibearAl]

Have 2 Sofirn C8F. One with the XPL, and the LH351D 90 CRI. I use LG M50 and Samsung 40T.

C8F - XPL
The M50 5000mAh gets a lot of run time, apprx 2600lm at start up - 2200lm at 30s.
The 40T 4000mAh gets less total run time, apprx 2800lm at start up - 2300lm at 30s,

Using TA Lumen Tube.

Haven’t ran tests on the LH351D 90 CRI version as I had just gotten it and haven’t charged full 21700 cells yet.

Between 2600-2800 of the M50 and 40T its not really noticeable to me, so for longer run times the 50T is fine, with 1000mAh more capacity and run time. On turbo it was hot enough to singe my fleece pants very quickly.

[hiuintahs]

@patmurris

@hiuintahs

I got me a Samsung 50E in the mail today. I charged it up along with topping off the Sofirn battery. I checked in my makeshift lightbox, the lux figure for each battery. Naturally, I expected to see a slightly lower reading with the 50E at the turbo level……………which I did.

And I expected to see the same output at the lower levels regardless of what battery was installed………….but instead what I saw was a lower level with the 50E battery at all levels. At the low level (not the moon mode……just level one), I’m getting 410 lux in my light box (about 7 lumens) with the 50E. And I’m getting 660 lux (about 11.8 lumens) with the Sofirn battery.

So I’m wondering why that is? Evidently this light is not current regulated? I guess I can be OK with it as long as I get proportionally longer run time with the 50E compared to the Sofirn battery.

At unregulated levels the driver uses PWM to modulate the output so it makes sense. When the leds are on they are at full power so they are brighter with a high current cell.

OK. Makes sense. Thanks for posting.

[cothyhu77]

Your C8F finally arrived? How is it? Mine finally got to the US on the 15th but unfortunately I’m living out of town due to current events so I won’t be there when it arrives. How is the beam compared to the original XPL-HD version?

[YogibearAl]

The beam has a tighter hotspot, although the spill pattern and extent looks to be similar from 5-6 ft away. Tint is definitely warmer, but within 6 ft you will still see artifacts of the reflector and a halo ring around the spill area. Less noticeable than the XPL version. The artifact seems to be the result of the shallow edges of the reflector and possibly the anti-reflective coating of the lens.

I do like the Higher CRI of the new one. I’ll have to use it a bit more, but its hard to tell a difference other than tint if they aren’t next to each other.