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

Awe man, that means the springs might be the cause of the lower amperage. I might bypass the springs instead of swapping the FET and see if the amps go up. I want to keep it stock for right now so I can do more measurements.

I hope that everyone who has recieved their SP70 is liking it. :smiley:

I have now created a new thread for the development of Sofirn's SP70 "BLF Edition".

https://budgetlightforum.com/t/-/56572

I hope all of you agree that this thread is now being separated for the "BLF Edition" might deserve to be discussed in detail elsewhere. Thus, this thread here can remain for any further discussion about the standard SP70. I therefore encourage you to post your ideas and suggestions for the "BLF Edition" in the new thread. I will try to keep track and collate any updates and progress during its development over there.

Jason, Dale and anyone else who could help me summarize the most important charecteristics about an improved SP70, please feel free to post it in the new thread.

Thank you very much!

Cheers,

Thomas

Ah damn it.

I know they are using BeCu, but they haven’t told me what type.

They could be using:

  1. BeCu C17200 22% IACS.
  2. BeCu C17530 38% IACS
  3. BeCu C17500 45% IACS

Looking at the current achieved here, it looks like they are using BeCu C17200.

On one hand, that means they are about 55% the conductivity of BeCu C17530 that I use, and the longer spring along with the thinner inner spring means there is much more resistance.

On the other hand, I do support their decision for cell compatibility purposes.
BeCu C17200 has close to the same mechanical properties as steel, but with 3-3,5x the conductivity of that.

That means variously sized 26650s and 21700 can fit in the same light without making it very hard to close the light.

Or they could just be using phosphor bronze. It’s obviously not steel though.

That means the BLF edition can be improved on that point however.

So, BeCu C17500 45% IACS would be best for lowest resistance?

I would include that information into the new SP70 BLF edition thread.

Yes, but the mechanical properties are quite bad.

BeCu C17530 is the best overall.

Alright, thank you BlueSwordM. I will put that into the wishlist of the BLF edition and suggest to follow up in the new thread. ;-)

I nitpik, that's what I do, but also to get the info out there as clear as I can, sometimes opinions added. The UI is quite usable as-is, but everyone has their own priorities of "musts" and "nice-to-haves"

But, I really do like this light!! It's amazing what it can do stock! Very happy with it, specially considering the cost.

I haven't followed all the reports on throw #'s, but again, very happy with mine with bypasses and good cells.

Agree with Tom E. post 2093. Like for a stock light.

Very happy with mine.Especially the large well defined hotspot.Quality,UI and tint all fine (my old eyes prefer cool white).While I will definitely be interested in a BLF edition I hope they don’t turn it into just another large thrower.

The Noctigon Meteor M43 Flashlight had Berylium-Copper springs (45% IACS) that went almost completely flat after a short time of usage. I can’t remember whether the spring metal was to blame or the extreme heat or both. Don’t remember what they did to fix it.

I’m sold on it - got two on the way.

@cncyana, that’s right.

BeCu C17500, while having the best conductivity of all BeCu spring alloys, also has very poor yield strength.

That means plastic deformation, especially with a small top diameter—-bottom diameter ratio, is a huge problem with the Intl Outdoor spring.

Doubt it was heat at all.

The stock M43 driver would never pull enough current to make the springs to hot.

Just for the record, there is no centering ring.

The base of the reflector doesn’t sit on the MCPCB either, instead, it seats on the cut shelf in the head via the belt around the reflector such that the base hovers approx 1-2mm above the MCPCB.

Interesting… I swapped out the MOSFET for an SIR404DP, changed the leads to Turnigy 16ga. With spring bypasses in place (still dual springs) and Samsung 30T’s freshly charged this light makes 10,500 lumens at start and drops down into the mid 8000’s by 30 seconds. In this case, the head IS starting to warm up nicely. :smiley:

Edit: Recharged the 30T’s, looks like it’s pulling 21.3A at start at the tail.

This pleases me :)

10,500 is the most I’ve ever seen from an XHP-70.2… and this is with my lightbox calibrated and diffused so the meter reading is actual numbers, I really feel like my meter is showing a little low but it’s where I wound up with 6 diffusion panels, the Maukka calibration lights were almost spot on, but low on the S2+ even if only a little.

I get 253.25Kcd at start and 236.75Kcd at 30 seconds on the meter at a 5M reading.

This is on the box, sorry, I guess I flipped the i8 to landscape AFTER I started the video. Technology sometimes eludes me…

My light has a centering ring.

Mine arrived 1 week ago with the standard (non-HD) batteries.
I was thinking of ordering a couple HD’s - as I understand that will increase the output a bit.

If there is a BLF version in the works, I would just wait for that light.

So the question is - when might the BLF version might be available?

TIA

Let the obsession begin. Again.