** BLF LT1M-Mini Project - The little Lantern! **

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xevious
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I’ve long admired the BLF LT1 as I watched it unfold starting 4 years ago. I hesitated to buy when the 1st version went live, as my lightning needs really didn’t urgently call for it (I use Matt Smith’s ice cream plastic tub solution). I also wanted to wait for the USB-C to USB-C version. Then as that was coming out, the power bank version was soon to follow, so I waited. And then, the changing of driver boards started to happen. So after all that wait, I decided to go with a v1 LT1. I was OK with getting Anduril v1. Yet, as luck would have it, I managed to get a USB-C to USB-C version that also has Anduril v2. My impressions of this light are very high. I missed the summertime use, but wow… the LT1 is such a wonderful design. I like everything about it.

TLDR; sign me up for the LT1M!

SIGShooter
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xevious wrote:
I’ve long admired the BLF LT1 as I watched it unfold starting 4 years ago. I hesitated to buy when the 1st version went live, as my lightning needs really didn’t urgently call for it (I use Matt Smith’s ice cream plastic tub solution). I also wanted to wait for the USB-C to USB-C version. Then as that was coming out, the power bank version was soon to follow, so I waited. And then, the changing of driver boards started to happen. So after all that wait, I decided to go with a v1 LT1. I was OK with getting Anduril v1. Yet, as luck would have it, I managed to get a USB-C to USB-C version that also has Anduril v2. My impressions of this light are very high. I missed the summertime use, but wow… the LT1 is such a wonderful design. I like everything about it.

TLDR; sign me up for the LT1M!

I added you but as a FYI you already signed up on 6/22/2020 (post 584) and 7/17/2021 (post 1055) Smile
skol
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Sign me up for 3

xevious
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SIGShooter wrote:
I added you but as a FYI you already signed up on 6/22/2020 (post 584) and 7/17/2021 (post 1055) Smile
Oh man, have I got a fault with my memory lately. Sorry, SIG. Facepalm
SIGShooter
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xevious wrote:
SIGShooter wrote:
I added you but as a FYI you already signed up on 6/22/2020 (post 584) and 7/17/2021 (post 1055) Smile
Oh man, have I got a fault with my memory lately. Sorry, SIG. Facepalm
No problem Smile

It only takes a few seconds to run the insert statement and about the same to search my database by name. I’ll leave you in for all 3 in case you want them Party

SIGShooter
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Additions to the interest list since post number 1136

Post# / Added / User Name
1138 / 09/19/2021 / iamnuts
1139 / 09/21/2021 / xertian
1139 / 09/21/2021 / xertian
1139 / 09/21/2021 / xertian
1139 / 09/21/2021 / xertian
1140 / 09/21/2021 / MelRR1229
1141 / 09/21/2021 / nydude
1142 / 09/24/2021 / xevious
1144 / 09/24/2021 / skol
1144 / 09/24/2021 / skol
1144 / 09/24/2021 / skol

DBSAR
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xevious wrote:
I’ve long admired the BLF LT1 as I watched it unfold starting 4 years ago. I hesitated to buy when the 1st version went live, as my lightning needs really didn’t urgently call for it (I use Matt Smith’s ice cream plastic tub solution). I also wanted to wait for the USB-C to USB-C version. Then as that was coming out, the power bank version was soon to follow, so I waited. And then, the changing of driver boards started to happen. So after all that wait, I decided to go with a v1 LT1. I was OK with getting Anduril v1. Yet, as luck would have it, I managed to get a USB-C to USB-C version that also has Anduril v2. My impressions of this light are very high. I missed the summertime use, but wow… the LT1 is such a wonderful design. I like everything about it.

TLDR; sign me up for the LT1M!

Big Smile Thumbs Up

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

Lux-Perpetua
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Update [2021-09-27]

Courtesy by Sofirn, some actual pictures of the new LT1M mini prototype. So far, LT1M mini will be using LH351D 2700K 90CRI and LH351D 5000K 90CRI, same as LT1. The idea to have red light included needs to be postponed as Andúril 2 is not yet capable of tint ramping with three channels (NW + WW + RED). LT1M mini works with 26650, 18650 (via adapter) and unprotected 21700 batteries.

 

raccoon city
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26650?

No offense, but I am less enthusiastic than before.  :X

Lux-Perpetua
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Both the LT1-team on BLF and Sofirn agreed upon a wider tube for following reasons:

  • 26650 tube width adds more stability against tip over; the size ratio of length and width is more appropriate
  • 26650 tube width adds more flexibility for battery standard sizes (21700, 18650 and 26650)
  • 26650 tube width allows to use common 3xAAA battery carriers for emergency use
raccoon city
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Lux-Perpetua wrote:

Both the LT1-team on BLF and Sofirn agreed upon a wider tube for following reasons:

  • 26650 tube width adds more stability against tip over; the size ratio of length and width is more appropriate
  • 26650 tube width adds more flexibility for battery standard formats (21700, 18650 and 26650)
  • 26650 tube width allows to use common 3xAAA battery carriers for emergency use

Just because there are good things about 26650 lights, that doesn't mean that there aren't bad things about 26650 lights, as everyone knows.

I may just pass on this 26650 light because I hate 26650 lights with a passion.

djozz
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Hmmm, my impression sofar was that the LTmini would be based on a 21700 battery, in fact a modified Sofirn IF25. Although more useful to me would be even smaller, a 18650 lantern would be ideal for me, instead it has grown to 26650 size now. That makes the size advantage over the LT1 quite a bit less, and makes me less interested too.

raccoon city
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djozz wrote:

Hmmm, my impression sofar was that the LTmini would be based on a 21700 battery

I believe that was the original plan.  :BEER:

The first day the number 26650 showed up in this thread was today.

derfyled
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I won’t cancel my pre-order but I agree with the Raccoon, the mini is now less desirable. 26650 is a dying breed and I don’t like to use adapter. 21700 is the future, I don’t see why we look backward. A slimmer body was the greatest part about an LT1 mini. It is now an LT1 Not-so-mini. The AAA compatibility seem great but let’s face it: I don’t think no one will ever use this feature.

EDIT: I can also see a problem (or danger ?) of someone trying to charge an LT1 mini with AAA in it…

I am not starting a rant or a war on how the LT1 mini should be, I’m trying to criticize a decision that seems strange in a civilized way, without lacking respect to all hard-working folks involved in this project.

Perception
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26650 is probably going to push me off the interest list. If size and weight aren’t an issue I’ll just use one of my LT1s. For the purpose this was originally intended (backpacking) though, both size and weight are a concern. I think a 26650 light is just going to come in too big for me. 21700 size was already pushing it for my purposes. There are already times when backpacking that I drop to a single cr123a light because I don’t want to carry an 18650.

raccoon city
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Yeah, no matter what maximum size (21700 or 26650) is chosen, I'm sure plenty of BLF members will be very happy, so I hope the project continues.

I don't know if it's too late to go back to a 21700 lantern, but that would make me the most happy.  :THUMBS-UP:

djozz
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As a reference, (I posted about it before) here is my take on a mini lantern, based on a 18650 flashlight, a Nichia E21A (2000K R9050) and an optic robbed from an old Philips led bulb. It is about as large as I would like the LTmini to be (the body is wide for an 18650 so a 21700 version of this would not be larger).

I have it in use for two years now and it is quite perfect and has great runtime for the purpose (usually it is a all-night light for my son at less than 10 lumen). It hangs or tailstands.

derfyled
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djozz wrote:
As a reference, (I posted about it before) here is my take on a mini lantern, based on a 18650 flashlight, a Nichia E21A (2000K R9050) and an optic robbed from an old Philips led bulb. It is about as large as I would like the LTmini to be (the body is wide for an 18650 so a 21700 version of this would not be larger).

I have it in use for two years now and it is quite perfect and has great runtime for the purpose (usually it is a all-night light for my son at less than 10 lumen). It hangs or tailstands.

I love it ! This is the type of size I had in mind, perfect for backpack carrying.

alex64
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People were in the groupbuy for 21700 battery. Changing the battery from one day to other to 26650 for me is a worse change.

 

Even if can use it with a short 21700 the thick body is still there.

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The mini doesn’t look that mini.

djozz
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After some studying the pictures, I assume that the length and width of the IF25 are preserved in this 26650 version? So it is not really bigger than the prototype? Still I think that 21700 battery tube size would be best.

As a (late) suggestion, perhaps the illuminating head could be downsized to make it more compact too. I know that it is tested by Den and he finds that the large surface area of the light source is good for soft illumination, but we are trying a compact LT1, if the head size is halved the “softness” will still be very ok. My lantern above has a very small surface area and it is still a pleasant illumination.

Phlogiston
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I actually like the idea of the LT1M becoming an 26650 light, given that I already have 26650s, but no 21700s.

The option to use 3×AAA cells in an adaptor for emergencies also appeals, since I have lots of AAA Eneloops. Although you can power the original LT1 from an external battery pack at reduced output, that arrangement isn’t a good plan in damp environments, so the ability to put AAAs inside the LT1M would be superior in that respect.

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As Lux-Perpetua said there are a number of pros in the ability to use a 26650 battery. Do they outweigh the larger diameter? That’s of course up to the individual to decide. Better stability against tipping over was discussed at length and for me that’s an important thing. And something to consider is that Sofirn is going to be marketing the mini to people other than us. I suspect that the ability to use AAA batteries in an emergency will be a plus for many non-BLF members.

It’s too bad that 26650 batteries don’t have any more capacity than 21700’s, but that’s a subject for another conversation.

DBSAR
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Lux-Perpetua wrote:

Both the LT1-team on BLF and Sofirn agreed upon a wider tube for following reasons:

  • 26650 tube width adds more stability against tip over; the size ratio of length and width is more appropriate
  • 26650 tube width adds more flexibility for battery standard sizes (21700, 18650 and 26650)
  • 26650 tube width allows to use common 3xAAA battery carriers for emergency use

Exactly! in a pinch, a 3-AAA cell holder can run it. Having the LT1M able to use either 21700, 18650, 26650, or a 3-AAA holder even from a dollar store light in an emergency adds to its versatility. (Also being slightly wider at the base makes it more stable. Thumbs Up

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

DBSAR
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Lux-Perpetua wrote:

Update [2021-09-27]


Courtesy by Sofirn, some actual pictures of the new LT1M mini prototype. So far, LT1M mini will be using LH351D 2700K 90CRI and LH351D 5000K 90CRI, same as LT1. The idea to have red light included needs to be postponed as Andúril 2 is not yet capable of tint ramping with three channels (NW + WW + RED). LT1M mini works with 26650, 18650 (via adapter) and unprotected 21700 batteries.


 



Great photos Lux! While its taller than some super compact lanterns, its still a lot smaller & lighter than the full-size LT1.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

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Since the head is wider than the base, a circular plate could be unscrewed from the top of the head and screwed on the bottom of the battery tube. Narrow for packing but a wide base when needed. Adds a part you can lose through.

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I agree with the LT1 team, I’d much prefer a 26650 version for the extra stability and battery flexibility.

Nothing worse than having a lantern which just constantly tips over when resting on any remotely uneven surface or from the smallest of forces.

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I like this change, but feel like the stability issue is just inherent to the design being a lantern head on the end of a flashlight, instead of a lantern designed from the ground up as a lantern. Maybe in a future project we could see a design without a separate body at all, with a single cell in the center of the head surrounded by the emitters? I’m picturing something like a BLF-ified Fenix CL26R. I get that there are costs and manufacturing issues and all that associated with building a new design from scratch, and I’m definitely not complaining about the LT1M, but maybe that’s an idea someone much more qualified than I am could tinker with eventually.

MtnDon
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djozz wrote:
As a reference, (I posted about it before) here is my take on a mini lantern, based on a 18650 flashlight, a Nichia E21A (2000K R9050) and an optic robbed from an old Philips led bulb. It is about as large as I would like the LTmini to be (the body is wide for an 18650 so a 21700 version of this would not be larger). I have it in use for two years now and it is quite perfect and has great runtime for the purpose (usually it is a all-night light for my son at less than 10 lumen). It hangs or tailstands.

That appears to be a very nice light mod, djozz. It fulfills the “mini” idea.

Barry0892
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It’s just a prototype now. The body size can be changed but different people have different opinions. How about a poll?

It’s not easy to wait such a long time for the LT1-mini, I hope most people like it.

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