➤ Sofirn LT1S review (1*21700, 2700-6500K, Type-C) I think we have a winnner

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Lumeniac
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➤ Sofirn LT1S review (1*21700, 2700-6500K, Type-C) I think we have a winnner

A capacious 21700 battery, type-C with power bank mode, choice of light direction (!), stepped and stepless color temperature and brightness adjustment, stabilization of brightness – Sofirn managed to make so damn good and relatively compact camping lanter. If full-sized Sofirn BLF LT1 is too bulky for you, then the new product may be just what you are looking for. Or maybe not – I’m sure that the Sofirn LT1S review will put everything in its place.

SPECIFICATIONS
LED: 2700K*18 CSP1919, 6500K*18 CSP1919, 4*Lattice Power Red Light
Battery: 1*21700
Size: 97mm (length) × 68mm (head diameter)
Weight: 257\334g (without\with battery)
Flashlight body: aluminum, scratch-resistant anodized
Mode memory: yes, including turbo
Reverse polarity protection
Low Voltage Warning: When the battery voltage is too low, the LED indicator in the side switch will flash rapidly.
Charging: type-C with power bank mode

You can buy Sofirn LT1S at:
Aliexpress (there is RE2YQV4TJCHT code in addition to the store coupon. if code doesnt work pls let me know)
AMAZON

my Sofirn LT1 review

You can save on purchases with coupons and promotional codes from the discount channel in telegram, see the link to it below in the “about the author” block.

Package and appearance
The most common cardboard box. Reliable and unpresentable.

Kit includes everything you need : LT1S itself, 21700 5000mah battery, Type-C charging cable, manual, o-rings. You can also buy a no battery version.


The camping lantern itself is made in the form of a pot-bellied truncated cone. We can say that this is the same BLF LT1, only without the “leg” of the battery compartment.

To make it clear, here you can compare the size of Sofirn LT1S with some of other flashlights and camping lanterns i own. LT1S, of course, is larger than the same Fenix ​​CL25\26R. But still much more compact than the Sofirn BLF LT1.

This form factor is well known and has both pluses and minuses. Namely: the flashlight gives good sidelight, but has a blind spot right below. The cone form of Sofirn LT1S is designed to make this area illuminated better.

The second popular design of camping lanterns, the “saucer” shines downward perfectly with no blind spot. But, as understant, it has no sidelight.

The base of Sofirn LT1S is wide, it stands securely. In principle, with such dimensions, several magnets can be glued inside. If the flashlight can only shine in one direction, then it can be magnetized so that it shines exactly down, which is actually convenient.


Springs are at both sides, great!

Open tailcap, and see the tube of the battery compartment. Sofirn LT1S is designed support only flat top 21700. Not long 21700 with PCB. Of course, you can also use 18650.

Remove the trim around the battery compartment and unscrew the locking ring, to get disassemble lantern. Let’s take this exciting journey.

I do not presume to comment on the circuitry, I will only show what is.
Ah, again, here are LEDs used here: 2700K*18 CSP1919, 6500K *18 CSP1919, 4*Lattice Power красного света









It is worth noting that when adjusting the color to any of the extreme positions (warm-cold), third-party light is still mixed to it a little. However, I did not feel that this had any effect on the final real use


there is an o-ring.

As any other camping lantern, Sofirn LT1S has suspension hook.

Also there are:

Control button. Round, soft, quite comfortable for blind find.
Simple 4-segment battery level indicator
Type-C charging connector. The plug is thick and seemingly reliable, it enters with a bang.



Charging is just amazingly fast, at some point it reaches 3A. It takes just 2 hours to fully charge 5000mah battery! For example, my goode olde Fenix ​​CL25R has a charging current of only 0.5A, while the modern CL26R already has 1A.

The current output in the power bank mode is also very good, 3A is really damn good and can help out a lot in a number of situations.

You have seen them exposed, now that how thes 8+8 LEDs for cold and warm light + 4 LEDs for red light looks like from outside.


UI
BLF LT1 is controlled by Anduril – a flexible, but quite sophisticated interface for many many combinations to remember. Sofirn LT1S has an interface that strikes a good balance of flexibility and simplicity.

The LT1S is much easier to handle.

Hold from ON – change brightness (including 3 red modes), from OFF – firefly
1 click – OFF \ ON
1 click + hold from ON – color temperature adjustment
2 clicks from OFF – turbo, from ON – selection of light direction (left, right, full), from red (strobe \ SOS)
3 clicks – red light
4 clicks from ON – switching between smooth and step brightness adjustment, from OFF – button lock
I don’t remember any Fenix ​​\ Nitecore model that would have access to a firefly and other goodies.

Best i`ve seen is that Nitecore LR50 \ 60R have the ability to switch the direction of light.

How Sofirn LT1S shines + real runtimes
Here the flashlight, which costs as a basic plastic model with a built-in battery by the same Fenix ​​\ Nitecore, shows itself in all its glory.

The flashlight has a stabilized light that does not sag in brightness even in turbo light with good CRI and no PWM flicker.

In real use, TURBO will rather blind you, it can be excessive for a illuminating tent. HIGH mode will be more better here, i think.

But in a room such as a gazebo, or in a house when the lights are turned off, Sofirn LT1S, with a couple of spare batteries, will allow you to get excellent brightness from for hours. And even more if you just use Type-C cable…

Runtime charts here are measured for 6500K, in a pantry at room temperature.

Accordingly, to understand runtime when you turn light on only at one side of lantern, you can simply double the runtime from these graphs.

Another nice advantage – Safire LT1S can work without a battery, purely from external power. But there is a nuance here. Turbo only works if 2700 or 6500K chosen. If you set an intermediate color temperature, then turbo will not start. So if you have a power bank or a wall power supply with USB-A or Type-C, you may well not waste battery power. A regular inexpensive 30000mah power bank will give you almost 12 hours of use at maximum brightness!

The flashlight has an excellent red light mode. In addition to the fact that it retains night vision, it also (according to reviews) does not attract any midges so much. I will clarify, not mosquitoes, they aim at you by body heat and CO exhaled, i mean midges.

The red light is excessively bright even in the lower mode, some red firefly mode would be good to add, I will inform Sofirn about this, it is quite possible that the next batch will include this feature


If you put or hang LT1S, you can turn on the direction of the light that will not blind you. For example, at home, you can turn on a firefly, direct light to the wall – this will be extremely convenient. The brightness of the firefly here is lower than that of Sofirn LT1, I think this is an advantage.



Yes, if we are talking about a firefly, there is no visible PWM at the lowest brightness.

If you wish, you can make some kind of suspension option, for example, just wrap it around the tail side and hang it like the same saucer. When I get to my countryhouse to drink moonshine and play balalaika, I test how lantern works when suspended horizontally and add photos.

Well, see for yourself. 500 lumens is really a lot. Actually. The LT1 is a bit brighter here, but it’s also a lot bigger.











What I like about the LT1 is that 5000K is the coldest light for it. Personally, I don’t have much interest in the 6500K. However, LT1S allows you to easily set these 5000K…

General impressions

I find Sofirn LT1S to be a very functional camping lantern. Even though it’s clearly smaller and lighter than the BLF LT1, it’s still big and heavy enough that I don’t consider it a camping lantern for serious professional tourism. These people are struggling for every gram of backpack and tourists are more likely to sacrifice brightness for the sake of compactness and less weight.

But Sofirn LT1S is just perfect for ordinary weekend trips, for fishing, hunting, camping, not to mention the cottage or city apartment

Yes, Sofirn BLF LT1 with its 4*1650 has longer runtime and is little bit brighter. But 21700 battery is also very capacious and in situations of use you will certainly have the opportunity to replace the battery with a fresh one. And, let me remind you, this camping lantern works great by external power source.

The gain in size is no longer so important in these situations – anyway, you will not be dragging the LT1S on your back. Though the price advantage is already definitely tangible.

But my favorite Sofirn LT1S feature is the ability to choose the direction of lighting. This makes it possible to place a flashlight in the horizontal suspension and just turn off the light that would go upward. So this light will not get wasted, neither blind you.

And this feature will also be convenient for home, for indoor use. Sofirn LT1S showed itself perfectly as a night light. I set the minimum brightness and directed the light to the wall. With the same CL25R, CL09 or LT1. I had to close the front side – otherwise even the minimum brightness was noticeable when i wake up for night run to fridge.

In the case of Sofirn LT1S, the minimum light directed at the wall allows you to navigate in room and does not get blinded, it does not interfere with night vision. This is where the red light at minimum brightness could be so damn good if red light also had “only one side” feature and firefly mode.

In general, for me personally, the latter is the only drawback of the flashlight. Not real drawback, actually. It just might be better.

In short, I am happy with Sofirn LT1S and ready to recommend it. Sofirn managed to screw up several times. But not this time. Yeah, some improvements could be made, but Sofirn LT1S is damn good camping lantern as is. Really great deal for a buck. And i hope my review proves it.
Actually, when i sent Sofirn my ideas of camping lanterns, i offered them OEM this 3*18650 powered saucer with UI improved and light stabilized. But I`m happy with result as well.

For me it is more interesting than BLF LT1 in terms of functionality, price and size. I think that LT1 wins only due to the colossal total capacity of the batteries and, accordingly, runtime. Of course, Sofirn BLF LT1 is still great. But now it has real rival -)

As i shoot more photos, I’ll add them. Although, I’m sure it’s clear how bright this camping flashlight is.

Edited by: Lumeniac on 05/06/2022 - 02:28
SammysHP
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Thank you for this awesome, detailed review! Looks like a very good lantern, although I’ve heard some bad experiences about the PWM in low modes. Are you sensitive to PWM or can you measure it (moving the camera quickly might be enough for a first test)?

Lumeniac
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bitte shёn.

i cannot measure it. but i did shower and pen test - passed successfully.

 

Maverick1947
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Are those high CRI LEDs? Even the 6500k ones? Awesome review btw!!

There’s no replacement for displacement.

Superstocker
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Thank you so much for the time and effort you put in this review. It is most informative and very helpful.

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Maverick1947 wrote:
Are those high CRI LEDs? Even the 6500k ones? Awesome review btw!!

I can’t answer that, but I don’t think it matters anymore once the light passes through the plastic translucent diffuser.

Agreed…great review, Lumeniac, as always! I don’t think I’ll be buying one of these for myself but the development and the end product has been really interesting. Quite a unique and quality tiny lantern!

blueb8llz
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Thank you for this review. I will be sure to pick one of these up when I see a better sale.

Jackie
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thanks for the review

samyy
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Great review with great pictures. Thumbs Up

iamlucky13
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Good review. Very detailed. It was difficult for me to get an effective sense of how it compares to the LT1 from the images, but I don’t think that’s critical. The key differences aren’t the beam, but the different form factor and user interface.

I also appreciate the disassembly pictures to help understand what is inside.

I read “f1825ist” on the microcontroller, which turns out to be a PIC16 series. I’m guessing that means no easy porting of Anduril to this lantern for those who want maximum commonality and flexibility. Fortunately, the user interface still sounds well thought out.

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Wow!

so much work went into this, I like it.
I have been using the LT1s for a while now and I like it a lot!

I made a shade for it, but it’s just slip-on, no locking feature.
https://www.thingiverse.com/thing:5187994

bobvoeh
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This would be a great light for my hurricane kit. Thanks for the review.

Lumeniac
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wow, wundershёn

looks damn good

 

Lumeniac
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Sofirn wrote me that 90 CRI

 

Lumeniac
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as promised, shot some extra pics and added video review





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Beautiful work on the shade!!!

Nooner
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Thank you for the amazing review.
You’ve convinced me I need one.
The SOFIRNAELT1S code doesn’t seem to be working. Was it limited?

Lumeniac
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thanx for feedback about code, will report to sofirn right now

Lumeniac
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code SOFIRNLT1S is updated, it works

Nooner
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Thank you for the code.
Just ordered one.

marcioccosta
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Great review and very informative! Is nice to see the disassembly. This lantern has a solid construction.
I have 2 of them and I like very much!
The only think I’d like to mention is the PWM is visible to me on moonlight mode and the ramping is a little too fast, so I leave in stepped mode. Nothing major to me.

Lumeniac
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hm, ur not the 1st one who mentioned pwm in moonlight. i tried to notice it, no success, luckily

 

 

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Nice review!
I have yet to get one to test & review, as i have been busy with the development of the LT1M (mini) and other things.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

will34
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Nice review, I hesitated when it was launched because Sofirn showed some runtime graphs where the output would drop to 60% in turbo after some time, now that I see it’s flat I will get one for sure.

Lumeniac
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to be objective, i admit that you can get this stepdown. perhaps in 2700K and in some hot conditions. i measured CW , room temperature. 

 

DBSAR
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While it s neat design to make a compact version of the LT1, it does not have near the run times capacity with its single cell, and it is a untested venture Sofirn decided to create on their own variant outside the design team that developed the original LT1 while using the design parameters & development we did with the original LT1 as a team. I have yet to get one to test to approve of this variant.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

sealionhr
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The code does not seem to be working at Aliexpress store. Is there any other code?

Lumeniac
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sorry, missed your message. i updated code , RQM1OOCXUNM1

 

djsz
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Thanks for the great review!

I just received mine today and have a question: Unlike the unit in the review, mine does not run on external power without a battery inserted and the tail cap tightened. The four LEDs light in succession as if the lantern is trying to charge its battery (and the top LED blinks), even when there’s no battery inserted. After a few seconds it seems like the lantern crashes and restarts, regardless of the brightness or color setting I’m in. I see the same behavior when plugged into a USB PD wall charger with a C to C cable. Does anyone have any experience with this?

A few clarifications: first, I can reproduce this with an A to C cable or a C to C cable. Also, I don’t need to turn the light on at all in order to see the lantern apparently crash when connected to external power.

Verodin
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Received one yesterday and did some minor test run tonight. One thing that stood out and that’s that the red light is uncomfortably bright, even on its lowest level. Nice idea, but totally unsuitable to have red light on the table in front of you. You mentioned the high brightness already, but it really stands out (in a negative way). Hanging it up somewhere works much better.

Love the directional light feature.

Oh and Sofirn really needs to address ramping. I don’t know a single Sofirn flashlight that has proper ramping at lower levels. The LT1S suffers from the same problem.

Thanks for the extensive review!

ico
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How to set the light at 5000k? It only blinks when it reaches 2700k or 6500k, right?

Also, are the other leds still really on if you’re already at the highest/lowest temp?

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