Sofirn SP70 Alone $50, PM for AMZ US CODE(LIMITED)

JasonWW · May 21, 2019, 8:43am

Your graph is not showing temperatures at all.

If it completed the 20A test without exceeding it’s max safe temperature (typically 80°C) then doesn’t that mean it’s rated for at least 20A?

PiercingTheDarkness · May 21, 2019, 8:59am

I’m still learning when it comes to the max discharge curve. Does it always have to reach 80 degrees to show a max rating?. I’ve seen tests from HKJ that have bad discharge curves which haven’t reached 80 degrees and they’re too high.

I’ve tested 14500 cells and the curves and capacity at that current look terrible without 80 degrees being reached.

EDIT: If I’m wrong them I’ll alter my first comment

PiercingTheDarkness · May 21, 2019, 9:06am

I edited my first comment. Everyone can make up their own mind as to whether the 20A is acceptable

Agro · May 21, 2019, 11:05am

cncyana:

the4ds9:

I now like my Sofirn SP70 more than ever. What happened was I noticed a voltage inequality between the 2 EBL 26650 cells after using to where they needed recharge. I correctly attributed this to the lack of good contact between cells, due to Flat tops. I drove to Home Depot and purchased a pack of Neodymium Disc Magnets (pictured). The foam adhesive removed easily, and the bare magnet fit the Flat top well. Now I can feel both cells are equally drained and the runtime has dramatically and to my great delight increased as one expects and hopes of 2x26650 5000 mAh rechargeable lithium ion batteries. Perfection achieved on a strict budget!

I think the magnet material itself is not a good electrical conductor and most of the current might be passing through the thin plating on the surface of each magnet (probably nickel plating).

No. Magnets having poor resistance is a myth. The material has poor resistance but large diameter and short length means the total resistance is negligible.

This magnet is a 1.53 mm long AWG –1 (yes, negative) solid NdFeB core wire. Despite poor material this conductor has a resistance of about 32 µΩ. This means that with a light pulling 10A the voltage drop is ~0.00032V.

Note that the number doesn’t include contact resistance which is likely higher than that (I would love someone more knowledgable to chime in).

In this case: the adhesive layer is likely an insulator which breaks connection.

JasonWW · May 21, 2019, 12:35pm

Try using the magnet on a cell in a battery charger that measures the internal resistance. You will see a big increase. I’m not sure if this directly effects the performance on a FET driver, I haven’t tried to measure the amp draw difference, but I assume it would.

That, plus the potential to move around if dropped and cause a short makes me not want to ever use them. I’ll just solder blob a cell or get button tops or solder on a button top.

PiercingTheDarkness · May 21, 2019, 1:38pm

20A at 64 degrees
25A at 70

Even though it didn’t hit the 80 degrees temp I don’t think it’s handling the 25A current well at all.

Keep in mind that my CBA has a voltage drop of 0.03V at 20A & 0.04V at 25A so it’s not spot on but works well enough to show performance

JasonWW · May 21, 2019, 4:36pm

There is more of this battery conversation here if anyone is interested.

nick779 · May 21, 2019, 6:39pm

Subbing.

Coman · May 21, 2019, 7:15pm

I will use Liitokala 26650 (5000mah specs), it’s ok ?

JasonWW · May 21, 2019, 8:47pm

The older cyan and black are good cells (a good choice assuming you can solder blob them for series contact), the new blue 5100mah seem to be questionable. Like always, buy from a reputable store that does not sale fakes.

Here is a repost of my battery tests from a few pages ago.

JasonWW:

Okay, I did some lumen testing on the SP70 with the Sofirn HD 25A, the black Liitokala and the Aspire 4300 with my Texas_Ace Lumen Tube and Maukka calibration light.

I noticed the light didn’t get hot as quickly as it did during my tail cap amp draw test. Sure enough, the springs on the tail cap do reduce output, so I did tests both with the stock “tail cap on” as well as with a short 8ga wire eliminating the tail cap resistance. I took measurements at Turn on and 30 seconds.

SP70 —————————————— T.O. —— 30s.
Sofirn HD 25A with tail cap - 5270lm, 4890lm
with 8ga wire across the tail - 5800lm, 5390lm

Black Lii 5000 with tail cap - 5250lm, 4700lm
with 8ga wire across tail - — 5570lm, 5200lm

Aspire 4300 with tail cap - 5080lm, 4720lm
with 8ga wire across tail - 5900lm, 5350lm

I took the wire across the tail measurements first then took the tail cap measurements second with about 3-5 minutes of cool down time in between, no recharging. So the “tail cap on” measurements might be a tad higher if I had recharged the cells fully in between, but not significantly higher. I just didn’t have time to do full recharges between every test.

These numbers are quite impressive. They are pretty much equal to my Lexel made FET driven L6 with ~~bypassed springs~~ dual BeCu springs from BlueSwordM and 5700K emitter from MTN E. I tested that light with the same black Liitokala 5000 and Aspire 4300 cells. I measured the L6 a short time ago with the tail cap on. I did “Turn on” and 20 seconds because the light got hot so fast. Here are the results.

Modded L6 ——— T.O. —— 20s.
Black Lii 5000 – 5300lm, 5100lm

Aspire 4300 – 5500lm, 5250lm

The Sofirn HD 25A cells also seem to be impressive. They beat the black Liitokala’s (maybe 60 cycles on them) and are really close to the Aspire 4300 cells (maybe 20 cycles on them). The Sofirn HD cells did not seem to draw the same amperage as the other 2 cells, yet the lumens don’t reflect that. It makes me wonder what spring bypass wires alone can do.

Just remember that lumens are tricky to measure with high accuracy and the Turn on numbers just flash for a quick second so I’m not sure how accurate that is. Maybe 1 second numbers are more accurate.

I also measured the parasitic drain at 1.88 milliamps. This is a lot lower than on the S70S which had a 4.43 milliamp drain. So it’s better, but still pretty high. I wouldn’t leave it powered up for months on end. Turn the tail switch off for any type of extended storage.

I plan to do a review thread with all my measurements and beam shots put together. I’ve just been super busy the last couple of weeks.

Coman · May 22, 2019, 9:08am

Why ?
Black Liitokala have 65.8mm
It’s perfect for Convoy L6 or Thorfire S70s. I use.

What is

? Pictures ?

Thx

PiercingTheDarkness · May 22, 2019, 11:13pm

Just perform your own spring bypass. You don’t need pictures of the 8ga across the tail.

JasonWW · May 23, 2019, 2:53am

I have black and cyan Liitokala and neither make contact.

I checked it closer, it’s 10ga and 8” long. Leftover speaker wire. No big deal.

Coman · May 30, 2019, 6:00am

I can not understand.

Thorfire S70s: 74mm (head) xhp70 (3960lm) - 87000cd (680m) max
Sofirn SP70: 90mm (head) xhp70.2 (5500lm) - 89733cd (687m) max

Why ?
Are they equal at distance throw ?

BlueSwordM · May 30, 2019, 6:06am

No, the Sofirn SP70 is heavily underrated.

JasonWW · May 30, 2019, 12:46pm

S70S is about 550 meters throw.
SP70 is about 860 meters throw.

You should never trust factory specs. Try to find good reviews where the lights are actually measured.

Coman · May 30, 2019, 3:04pm

I wait for night and I try them.
Convoy L6 new vs SP70

nick779 · May 30, 2019, 4:56pm

.

Relampago · May 30, 2019, 5:49pm

Make sure to post beam shots!

Coman · May 30, 2019, 7:41pm

I have nothing to take pictures of.
I have a phone (2016 flagship with android), but she does not see it very well. I would need someone with a tripod or take the pictures while I use the torch.
I’ll try if I find someone.

I finished testing:
-SP70 is, in my opinion, about 15-20% stronger in the distance and has more lumens than the Convoy L6 new (xhp70.2 + SMO). It’s a great flashlight for this price. I mean I can see it with her. I can not say how many meters, but a convoy building I could not see it well, just the roof shone a bit, while the SP70 lightens the whole building.

Excuse my bad English.

*As a small summary:
-Convoy L6 NEW wins the Thorfire S70s (I sold Thorfire)
-SP 70 wins the Convoy. :)*

Unfortunately, it did not come in perfect condition, it still has small defects, probably it was hit (but not during transport). She had a lot of dust on it. Packaging is not ok, the Astrolux lanterns are packed more nicely
I’ll be back tomorrow if I have time with pictures.