[Technical discussions] Sofirn SP35 - SST40, 21700 size, buck driver

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Funtastic
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TheIntruder wrote:
The first video has landed:

https://www.youtube.com/watch?v=Q9K4OkFs9Qk

Looks pretty good.

Hope somebody eventually tests how well the regulation works.

I have a test unit and the regulated output does a good job. The first batch is a big fail when the ATR doesn’t work, mine hit 80°C after 5 minutes on Turbo.

Beam profile has artifacts that I hate though, there’s a circle around the outer hotspot and you can see the corners of the SST40 as slight dark spots in the center of the hotspot. Most of us will notice but the average user will be quite happy. The SC31 Pro has the same smooth reflector and SST40 and it doesn’t show these artifacts. I think they should change to an OP reflector as a fix.

Just about to go outside for some beamshots on a decent camera, video should be up by tomorrow night.

I don’t like the tail cap being a larger diameter, the built up sides make tail standing no good unless it’s a completely smooth and level surface. Should of just had the same tail as the SP32A and smoothed/rounded off the the sharp edges.

Texas Ace Lumen Tube calibrated with maukka lights

New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)

YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)

Funtastic
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zoulas wrote:
Is this it?

https://sofirnlight.com/sofirn-sp35-21700-usb-rechargeable-flashlight-su...

No step down, is that better?

The first batch has a bug where the thermal regulation doesn’t work. Wait for the next batch if you prefer it.

I love full manual control for extended use, so this is a bug I like. Without ATR working, High mode ran for 2 hrs 13 minutes at a stable 860 lumens before shutting off at 2.80 volts

Texas Ace Lumen Tube calibrated with maukka lights

New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)

YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)

Muto
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Funtastic,

Is the tint on your sample version 5000k or 6500k?
Also in the Sofirn web page listing it now has 2 battery options, 4000mAh and 5000mAh?
Do not know of 5000mAh in 21700 from Sofirn
No step down is tempting. Love that run time on High as well, have a new appreciation of current control buck drivers.

Also do you know if the ones that are being sold on Amazon will be ver 2?
They say “Arrives: Jan 14 – Feb 5” so they are giving lots of lead time which may mean new version.
Thanks!

Keith

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“History doesn’t repeat itself, but it sometimes rhymes,” Mark Twain

After the Apocalypse there will be only 2 things left alive, Cockroaches and Keith Richards

gchart
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I ordered one from Amazon a couple days ago and can confirm that it’s shipping from China. I’ll do a full runtime test when it gets here. Hopefully it’ll be like other Sofirn items I’ve ordered lately and it’ll take ~2 weeks to get here.

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I'd like it, but... That button sure looks like a driver mount style - agree, Sofirn likes this style but they did do it the right way with the SC31B and SC31 Pro.

Ohh - with my SC31 Pro, I swapped the 6500K SST-40 for a 5000K SST-40. I don't see any loss in output. The output actually went up: 2100 (calibrated) at start now, running at about 9 amps (was 1980 at ~8 amps). I don't even bother with 30 sec measurements on lights like this cool.

With these LED's, the output is governed by the binning, and I didn't see the available 5000K's binned any lower, or much lower? Least I can recall. Even with the old XPL's, the bins of high NW's (5000K) matched the CW bins (XPL V6's, like used in the Q8). You drop bins big time for high CRI, or warm tints - that they haven't improved on yet.

Funtastic
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I used a Samsung 40T for the following

High runtime – 2 hrs 13 min – maxed out at 60°C with room temp at 24°C

Turbo (no cooling) until hitting 80°C

Texas Ace Lumen Tube calibrated with maukka lights

New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)

YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)

Funtastic
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Check out the runtime graph on the OP. You can see that 1750 ish lumens was the starting point, why has Sofirn rated it at 2000 then.

My measurements at 30 sec

1750 turbo
868 High
364 Med
114 Low
6 Eco
Moon (not measured)

We’ve often thought Sofirn’s calibration was off, what if it isn’t, and they’re purposely bumping up the numbers for marketing.

Texas Ace Lumen Tube calibrated with maukka lights

New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)

YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)

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For those interested in buying SP35, there's a new sales thread online...

https://budgetlightforum.com/node/75741

 

funwok
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Hey funtastic,

I have one of the first SP35 and I agree with your assessment that the beam is quite not nice to look at. You wrote that Sofirn already updated the reflector, do you know if we can somehow get our hands on those new ones? I am quite happy with my buggy SP35 without thermal regulation though, would love to have a smoother beam.

Funtastic
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funwok wrote:
Hey funtastic,

I have one of the first SP35 and I agree with your assessment that the beam is quite not nice to look at. You wrote that Sofirn already updated the reflector, do you know if we can somehow get our hands on those new ones? I am quite happy with my buggy SP35 without thermal regulation though, would love to have a smoother beam.

I was told by Barry that the old reflector was only used on the first 100pcs. I don’t think enough people have received their SP35’s to know if it has been fixed.

I suggested using an OP reflector but Barry said to wait and see if the new reflector would be okay.

I’ll try and remember to ask Sofirn if they’ll sell the new reflectors separate

Texas Ace Lumen Tube calibrated with maukka lights

New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)

YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)

funwok
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Funtastic wrote:
funwok wrote:
Hey funtastic,

I have one of the first SP35 and I agree with your assessment that the beam is quite not nice to look at. You wrote that Sofirn already updated the reflector, do you know if we can somehow get our hands on those new ones? I am quite happy with my buggy SP35 without thermal regulation though, would love to have a smoother beam.

I was told by Barry that the old reflector was only used on the first 100pcs. I don’t think enough people have received their SP35’s to know if it has been fixed.

I suggested using an OP reflector but Barry said to wait and see if the new reflector would be okay.

I’ll try and remember to ask Sofirn if they’ll sell the new reflectors separate

That would be very much appreciated Smile

I ordered my SP35 back in Nov/Dec I believe when they didn’t had them in stock yet to send out. Arrived shortly after Christmas here, so I am pretty sure I have one of the first ones. No thermal regulation, gets pretty hot Big Smile

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I ordered the SP35 kit from Amazon on 06JAN21 and it arrived on 14JAN21. Kit was complete, with 21700 4000mAh battery, clip, lanyard, and O-rings (o-rings are in the small ziplock bag with the lanyard, look closely). I’m impressed with the output of this Sofirn, it lit up my 2-acre pasture (0.8 hectare for the rest of the world) very well. Eco mode is sufficient for me to walk inside my house with all other lights off. UI works as per owners manual, I like the double-click to go from Off to Turbo mode.

"Not what we have but what we enjoy, constitutes our abundance." - Epicurus

gchart
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I received my SP35 about a week ago and have been playing around with it. Overall, I really like it! My review is up here

Pretty much everything I’m seeing is inline with what Funtastic has mentioned so far. The only exception is either I have an updated reflector or I’m less sensitive to the beam, one of the two.

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Got mine today, but I am very disappointed!
With a full Molicel P42A mine barely reaches 5.4 A at turnon (tested with several cells and even VTC6, despite them not fitting…).
And it has only 21 kcd which is way below the 27.5 kcd that were promised…
That seems way off – is my flashlight defective or did you guys get similar results?

gchart
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Hmm, I measured 24,250 cd which is just a little below spec. With regards to the amp draw, remember this is a buck driver, not a FET. Instead of burning of excess voltage, it trades volts:amps. You may be seeing 5.4A at the tail, but it’s likely still delivering 6 amps to the LED because of the buck.

gchart
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For the modding crowd out there, I was able to easily break the glue loose. I’ve got some pics and dimensions here: https://budgetlightforum.com/comment/1736969#comment-1736969

BurningPlayd0h
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Beamstop wrote:
Got mine today, but I am very disappointed! With a full Molicel P42A mine barely reaches 5.4 A at turnon (tested with several cells and even VTC6, despite them not fitting…). And it has only 21 kcd which is way below the 27.5 kcd that were promised… That seems way off – is my flashlight defective or did you guys get similar results?

27kcd is just simply a very optimistic rating for a light with a reflector that small and emitter that large.

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How much differences in throw would this have over sc31pro?

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Tendou wrote:
How much differences in throw would this have over sc31pro?

Probably very little, the reflectors can’t be very different in dimensions, the emitter is the exact same and is driven to basically the same level (maybe a bit less even).

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gchart
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The one and the same!

It looks like they’ll also be stocking it at Amazon eventually (non-aff link). I bought mine through Amazon; it shipped from China and arrived relatively quickly. Good pricing on the one directly from Sofirn’s website. When I buy stuff there, it usually arrives within a couple weeks – pretty fast for China shipping.

zoulas
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gchart wrote:
The one and the same!

It looks like they’ll also be stocking it at Amazon eventually (non-aff link). I bought mine through Amazon; it shipped from China and arrived relatively quickly. Good pricing on the one directly from Sofirn’s website. When I buy stuff there, it usually arrives within a couple weeks – pretty fast for China shipping.

Dumb question, I am trying to learn all the terminology, what is the advantage of the buck driver (vs. which driver?)

gchart
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More controlled/consistent output and, if implemented correctly, more efficient than some other styles. There’s an explanation thread here

zoulas
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gchart wrote:
More controlled/consistent output and, if implemented correctly, more efficient than some other styles. There’s an explanation thread here

Thanks, I will read more about it.

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Funtastic wrote:
funwok wrote:
Hey funtastic,

I have one of the first SP35 and I agree with your assessment that the beam is quite not nice to look at. You wrote that Sofirn already updated the reflector, do you know if we can somehow get our hands on those new ones? I am quite happy with my buggy SP35 without thermal regulation though, would love to have a smoother beam.

I was told by Barry that the old reflector was only used on the first 100pcs. I don’t think enough people have received their SP35’s to know if it has been fixed.

I suggested using an OP reflector but Barry said to wait and see if the new reflector would be okay.

I’ll try and remember to ask Sofirn if they’ll sell the new reflectors separate

Does your SP35 beam look more like the one on the left or the right?

Left side beamshot is an “early batch” SP35, probably belonging to the 1st 100pcs.
Right side beamshot is a bit newer SP35.
(both shots taken at same camera setting: 1/10th second shutter speed, daylight white balance, ISO-800)

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I’m guessing that, as a dealer early in the queue, and provided with a preview unit, Funtastic received one with the original reflector with the larger but inconsistent spill (“left”).

The beamshots in gchart’s review resemble the one of the right with the newer reflector, with a more clearly defined hot spot, less spill, and better uniformity.

It would be nice if Sofirn were to provide some official clarity on which version one would ship if ordering now. The sales figures on their stores (~150+ sold) would suggest that the early batch has been exhausted, but that would only apply if they don’t commingle the two versions in stock, with each shipment a random draw, and a lottery for the customer.

Something that hasn’t been mentioned here, but on TLF, are plans for a 35T, with a tail switch.

Tendou
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Based on the sp35?

Funtastic
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TheIntruder wrote:
I’m guessing that, as a dealer early in the queue, and provided with a preview unit, Funtastic received one with the original reflector with the larger but inconsistent spill (“left”).

The beamshots in gchart’s review resemble the one of the right with the newer reflector, with a more clearly defined hot spot, less spill, and better uniformity.

It would be nice if Sofirn were to provide some official clarity on which version one would ship if ordering now. The sales figures on their stores (~150+ sold) would suggest that the early batch has been exhausted, but that would only apply if they don’t commingle the two versions in stock, with each shipment a random draw, and a lottery for the customer.

Something that hasn’t been mentioned here, but on TLF, are plans for a 35T, with a tail switch.

No idea if they mixed them, good question.

Here they mention the SP35T so knew something was on its way

Yeah, definitely was the one on the left. Quite a shame as it makes the beamshots in my video review useless now.

Texas Ace Lumen Tube calibrated with maukka lights

New Zealand store – https://www.piercingthedarkness.co.nz (NZ customers only)

YouTube channel – https://www.youtube.com/channel/UCIUWi2vYp4CWrRkOJM70t_w/videos (Demos for my customers, and reviews)

funwok
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Yes, mine looks like left too.

A little bummer really, if anybody knows if we can get replacement reflectors that would be neat Big Smile

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What’s wrong with the one on the left? Just looks floodier to me.

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