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

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Day_Light
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I’m Interested for 3 items

johnpc
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Interested in two, thanks!

mukenukem
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Interested.

mmxrico
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Definitely interested for two, please add me to the list. Thank you!

Sparky.
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7 Please .. .. Thank You !!

LT1-Mini-Project
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> UPDATE,Feb,12,2020

- Ok all, here is the video explaining how i refined a lantern head for the LT1 Mini and still use the original IF25 LED up-firing configuration, with the original quad-TIR optic still used. I will get the drawing of how it was done completed soon, explaining its principle and how the Mini V1 prototype works. Here i have modified the LT1 Mini with the same LH351 2700K and 5000K 3535 LEDs as used in the full size LT1 lantern. As planned for the production version, it will have the same LT1-Andruil operating firmware as the fullsize LT1, some body design changes, side switch changes, base cap changes to add a removable magnet, (the magnet will help hold a wider accessory base plate for more stability) and add a 18650 sleeve so it can be used with a single 21700 or 18650 cell.

BLF LT1-Mini Lantern Project

alex64
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Interested.

SammysHP
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I’d like to quote my comment from YouTube here:

Quote:
After watching the whole video I should reword my comment: After sending you my first drafts of this concept in early November last year (sadly without getting an answer) I thought you simply fine-tuned that design. But you took it in a slightly different direction.

Your design focuses on the central diffuser tube which I didn’t have in my design. I rather quickly decided that a flat mirror does not have the optimal efficiency. To minimize glare I decided to use a very opaque diffusion material which my design relies on. Reflecting the light down into the TIR optics “recycles” some light in the phosphor, but also dissipates a lot at the MCPCB and converts it into heat. Although I haven’t measured it, it increased the temperature of the head noticeably. To minimize glare I designed the reflector in a way that most light is reflected downwards, but just not into the optics again.

I think your design should be able to provide a better efficiency if properly tuned. Have you tried different shapes of the central diffuser tube? Or some kind of reflector that covers the lens except for the TIR optics. You should also try orange peel mirrors to scatter the light. Every reflection causes losses so you want to reduce the number of bounces. Also the goal seems to be to redirect as much light as possible to the central diffuser.

vinte77
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interested in 2

DBSAR
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SammysHP wrote:
I’d like to quote my comment from YouTube here:

Quote:
After watching the whole video I should reword my comment: After sending you my first drafts of this concept in early November last year (sadly without getting an answer) I thought you simply fine-tuned that design. But you took it in a slightly different direction.

Your design focuses on the central diffuser tube which I didn’t have in my design. I rather quickly decided that a flat mirror does not have the optimal efficiency. To minimize glare I decided to use a very opaque diffusion material which my design relies on. Reflecting the light down into the TIR optics “recycles” some light in the phosphor, but also dissipates a lot at the MCPCB and converts it into heat. Although I haven’t measured it, it increased the temperature of the head noticeably. To minimize glare I designed the reflector in a way that most light is reflected downwards, but just not into the optics again.

I think your design should be able to provide a better efficiency if properly tuned. Have you tried different shapes of the central diffuser tube? Or some kind of reflector that covers the lens except for the TIR optics. You should also try orange peel mirrors to scatter the light. Every reflection causes losses so you want to reduce the number of bounces. Also the goal seems to be to redirect as much light as possible to the central diffuser.

sorry i must have missed the messages. I have tried many different types of center diffusers & shapes of it, top reflectors, (white, opaque, mirror, satin, etc) and same goes for the lens/globe designs. If i knew it would not drive inital MSRP cost up, I would still go with the down-firing design of the full size LT1, as that has tested superior than any other design I worked or or seen on any lantern or shade shoved over a flashlight. The goal of a lantern is to produce light, as evenly as possible, 360 degrees in all directions, as smoothly as possible, with as little eye-glare as possible, with the minimum hard-lighting & artifacts as possible, with as little angular-tint-shift as possible from different angles, etc. I have yet to find any factory consumer LED lantern that can do that, and the same goes for older incandescent lanterns.
as the initial cost of the host IF25 from Sofirn runs between 34 to 39 USD, by utilizing its current up-firing design the best, most light-efficient, smoothest way possible to achieve as close to that the BLF LT1 does was my goal, and to keep their manufacturing cost as close to the IF25 base regular price as possible.
I understand people will have different opinions, different design ideas, and different thoughts on it, and many have helped me with tips and ideas to work on something that works, without making it over-complicated to drive up cost. a team worked on the BLF LT1, with members like Toykeeper, Lexel working to perfect hardware & software, and other team members bringing in suggestions and ideas, as well as helping with the logistics, (interest list keeping by SigShooter, logo design refinement by amishBill, and other support from SBslider, Barry of Sofirn, etc. it was a monumental task to get the LT1 to the market as a reality.
We will be drafting up a basic cross section of the Mini and how it works as tested in the prototype soon.
I do appreciate your tips and pointers, and be rest assured most of them have been tested and still under some testing & refinement to get it to work.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

kemosabi
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Hello,

I am interested

bulbed
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Couldnt find any info around my question..Can the mini LT1 be turned to regular flash light or its always have diffusers

SIGShooter
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Just realized that I forgot to post new additions in a comment whenever I updated the interest list. Going forward I’ll do that so that it’s consistent with how things were done with the LT project.

9mm/40cal/45cal bullets and large/small pistol primers available for sale in San Francisco Bay area

dick33
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Hi,
I’m interested in one, please!

led_400
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interested

DBSAR
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bulbed wrote:
Couldnt find any info around my question..Can the mini LT1 be turned to regular flash light or its always have diffusers

Unsure yet, but i am working to see if it possible for the LT1 Mini to be able to have the lantern head un-threaded, and thread on a standard lens & bezel, to have a LT1/IF25 flashlight variant that has the LT1 Andruil firmware and features, and it is certainly a possibility with this design.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

el_duderino
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Interested in 2, please.

Caleb
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In for one… perhaps more.

Caleb
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Has a strong magnet in the base been discussed?

agent80
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DBSAR wrote:
bulbed wrote:
Couldnt find any info around my question..Can the mini LT1 be turned to regular flash light or its always have diffusers

Unsure yet, but i am working to see if it possible for the LT1 Mini to be able to have the lantern head un-threaded, and thread on a standard lens & bezel, to have a LT1/IF25 flashlight variant that has the LT1 Andruil firmware and features, and it is certainly a possibility with this design.

The screw-on diffuser would make it very versatile for any use. This would also open the relative ease with which Sofirn can create multiple colored diffusers.

Kombatt
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Interested!

atabalat
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Interested in one.

PBNinja
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Most certainly interested in 2. Particularly if Sofirn offer with a battery as they did with the fabulous LT1.

dealgrabber2002
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Caleb wrote:
Has a strong magnet in the base been discussed?

Yes. planning to use magnet to attach a base for more stability.

DBSAR
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Caleb wrote:
Has a strong magnet in the base been discussed?

Yep, its planned. likely a removable neodymium coin-sized magnet, so that the magnet can be used to hold a wide, flat base plate for more stability, and also so it can stick to metal surfaces, like car body surfaces, metal tent poles, etc.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

Marcello
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Interested in one, thanks!

SIGShooter
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These are the entries added to the interest since 02/12/2020 11:12AM PST.

Post# / Dated added/ Name
280 – (added 02/12/2020) vinte77
280 – (added 02/12/2020) vinte77
282 – (added 02/12/2020) kemosabi
285 – (added 02/12/2020) dick33
286 – (added 02/13/2020) led_400
288 – (added 02/13/2020) el_duderino
288 – (added 02/13/2020) el_duderino
289 – (added 02/13/2020) Caleb
292 – (added 02/13/2020) Kombatt
293 – (added 02/13/2020) atabalat
294 – (added 02/13/2020) PBNinja
294 – (added 02/13/2020) PBNinja
297 – (added 02/13/2020) Marcello

9mm/40cal/45cal bullets and large/small pistol primers available for sale in San Francisco Bay area

Funtastic
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Put me down for 10

Texas Ace Lumen Tube calibrated with maukka lights

New Zealand store – https://www.piercingthedarkness.co.nz

SIGShooter
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Funtastic wrote:
Put me down for 10
You’re the new leader in mini-LT’s desired!!!

The next set of updates, whenever I get around to it, will show your 10 Smile

9mm/40cal/45cal bullets and large/small pistol primers available for sale in San Francisco Bay area

bulbed
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@DBSAR..I would love to have the LT1 function both as lantern and standard lens & bezel..even as added accessories
Personally LT1 is small enough for most of camping needs and use in blackout but LT1 mini say in car or walking some around in campsites.Please make it happen…:)

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