*BLF LT1 Lantern Project) (updated Nov,17,2020)

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amishbill
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xevious wrote:
Great, thank you for this Bill. While the odds of getting one are probably slim, if you’re unlucky to get one you’re stuck with having to mail it back… which adds significant expense & time. I think I’ll wait for the 5.0 version!

If you have soldering iron (or reportedly an old-school pencil) you can close or open the pads on your own in a few minutes. Having the wrong pads open or closed is a mis-configuration. This runtime vs max brightness adjustment was always intended to be a user-serviceable item.

DIY LT1 battery wrap image. "PDF on Google Drive":https://drive.google.com/open?id=1IHIEOi1NXu868IYNCzIM7D2Ulpxchmww

Fresh Sanyo NCR18650GAs already wrapped "for sale HERE":http://budgetlightforum.com/node/69120 if you like.

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Just got my LT1 a week ago. Love it.
A question,

When charging, mine stops with the batteries at 4.16v.
This is wonderful as far as I’m concerned. Helps with longevity.

Is this by design, or am I just lucky?

Glad you’re hanging in there Dennis.
All the Best,
Jeff

SIGShooter
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jeff51 wrote:
Just got my LT1 a week ago. Love it.
A question,

When charging, mine stops with the batteries at 4.16v.
This is wonderful as far as I’m concerned. Helps with longevity.

Is this by design, or am I just lucky?

Glad you’re hanging in there Dennis.
All the Best,
Jeff

I have 2 that stop at 4.17v and 1 at 4.2v so I’m guessing it’s a matter of luck more than design.
jeff51
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SIGShooter wrote:
jeff51 wrote:
Just got my LT1 a week ago. Love it.
A question,

When charging, mine stops with the batteries at 4.16v.
This is wonderful as far as I’m concerned. Helps with longevity.

Is this by design, or am I just lucky?

Glad you’re hanging in there Dennis.
All the Best,
Jeff

I have 2 that stop at 4.17v and 1 at 4.2v so I’m guessing it’s a matter of luck more than design.

Cool,
Glad I got one that stops a little low.
All the Best,
Jeff

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jeff51 wrote:
Just got my LT1 a week ago. Love it.
A question,

When charging, mine stops with the batteries at 4.16v.
This is wonderful as far as I’m concerned. Helps with longevity.

Is this by design, or am I just lucky?

Glad you’re hanging in there Dennis.
All the Best,
Jeff

I to prefer the lower termination voltage of charging, (better for the cells) the variation between lanterns is likely due to if your using different typs of cells in different lanterns i found, and variations in the TP5100 charging chip programming.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

jeff51
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What are you all seeing for a low voltage cutoff?

Mine shuts down at 2.65v.
I had to use a single crappy cell to test that.
Using the 4 Sofirn cells, the darn thing shines forever!

Also mine is the Rev 5 version. I got only about 1.5a max charge using the included cable.
The power supply I used is capable of more. It’s a QC 3.0 (supposedly).
Don’t care really, it’s a wonderful lamp.
If I need faster charging the Vapecell S4+ gets thing done quickly.
Just curious what you are getting.

All the Best,
Jeff

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jeff51 wrote:

Also mine is the Rev 5 version. I got only about 1.5a max charge using the included cable.
The power supply I used is capable of more. It’s a QC 3.0 (supposedly).

Jeff

The charge circuit only supports basic charge currents. One of the design criteria was to be chargeable from low current sources like a small solar panel. A high current fast-charge was not pursued for various reasons, including maximizing cell lifespan with slow charging.

DIY LT1 battery wrap image. "PDF on Google Drive":https://drive.google.com/open?id=1IHIEOi1NXu868IYNCzIM7D2Ulpxchmww

Fresh Sanyo NCR18650GAs already wrapped "for sale HERE":http://budgetlightforum.com/node/69120 if you like.

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amishbill wrote:
jeff51 wrote:
… Also mine is the Rev 5 version. I got only about 1.5a max charge using the included cable. The power supply I used is capable of more. It’s a QC 3.0 (supposedly). … Jeff
The charge circuit only supports basic charge currents. One of the design criteria was to be chargeable from low current sources like a small solar panel. A high current fast-charge was not pursued for various reasons, including maximizing cell lifespan with slow charging.

Cool,
I understand now. Thanks
All the Best,
Jeff

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IIRC mine stops at 4.17 also. I tend to only charge it until I see 4.1 blinks anyway. Had it for 8 months now, maybe charged it 4 or 5 times? This time of year it doesn’t get used much, but from Oct to Mar/Apr, it got used an hour a day easy. I love candle mode in the morning.

somehow having a sunrise alarm function would be off the charts.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

DBSAR
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sbslider wrote:
IIRC mine stops at 4.17 also. I tend to only charge it until I see 4.1 blinks anyway. Had it for 8 months now, maybe charged it 4 or 5 times? This time of year it doesn’t get used much, but from Oct to Mar/Apr, it got used an hour a day easy. I love candle mode in the morning.

somehow having a sunrise alarm function would be off the charts.

If it had a programmable timer, (for turning it off or on) would be a great option for those who want the LT1 to turn on at a certain time & off at a certain time every day. (especially for those living in remote locations of the North where there are 40 days of night and no sunlight.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

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DBSAR wrote:
[...]where there are 40 days of night and no sunlight.

I couldn't help but suddenly remembered this film... Big Smile

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iamlucky13 wrote:
djozz wrote:
I have a request for someone who has experience and is willing to do circuit board drawings and upload it to Oshpark (as I can not do that)

Here is the LT1 ledboard:

….
The request is to draw a commonly from Oshpark orderable frp replacement ledboard for 2×20 standard 3030-size midpower leds, so 20xwarm and 20xcool. If the warm and cool leds can be mixed well (as far as the traces allow), the tint mixing of the lantern will profit.
This makes the LT1 suitable for the entire range of available standard midpower leds, including Optisolis, SunLike, and all the others.
….
Of course if someone dares to have real MCPCB’s for 3030 leds made and sold, that would even be better. But it all starts with the design.

I had a similar idea to this 6 month old post from djozz, and his suggestion is the only post that seems to have turned up in my search.

I just wanted to add that if anybody does this, I’m interested as well – thin FRP or flex PCB from Oshpark, or else an MCPCB in a group buy.

Or perhaps Clemence might be interested? The LH351D’s are pretty good, but I’d love to how the lantern looks with Optisolis or E17A’s in there, and perhaps try a slightly different CCT range.

I guess I’ll bring this up again – I recognize there might simply be no one browsing the thread with the time and skills to design a custom emitter PCB for this lantern as a mod option.

But is anybody else at least interested in alternative emitter options? Usually there’s a decent number of people eagerly looking for even higher color performance than R9050 equivalent and a slight green tint on the cool end. Should we keep a conversation simmering about this or let it go?

DBSAR
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Lux-Perpetua wrote:

DBSAR wrote:
[…]where there are 40 days of night and no sunlight.

I couldn’t help but suddenly remembered this film… Big Smile


Thumbs Up Big Smile

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

DBSAR
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iamlucky13 wrote:

I guess I’ll bring this up again – I recognize there might simply be no one browsing the thread with the time and skills to design a custom emitter PCB for this lantern as a mod option.

But is anybody else at least interested in alternative emitter options? Usually there’s a decent number of people eagerly looking for even higher color performance than R9050 equivalent and a slight green tint on the cool end. Should we keep a conversation simmering about this or let it go?

I do have the original design drawing, but the production one has been changed a little from that.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

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DBSAR wrote:
sbslider wrote:
IIRC mine stops at 4.17 also. I tend to only charge it until I see 4.1 blinks anyway. Had it for 8 months now, maybe charged it 4 or 5 times? This time of year it doesn’t get used much, but from Oct to Mar/Apr, it got used an hour a day easy. I love candle mode in the morning.

somehow having a sunrise alarm function would be off the charts.

If it had a programmable timer, (for turning it off or on) would be a great option for those who want the LT1 to turn on at a certain time & off at a certain time every day. (especially for those living in remote locations of the North where there are 40 days of night and no sunlight.

Too true. The alarm clock function might be hard to do (as far I understand), the timing is not really swell in these circuits over a period of time.

BUT, I would trade all the blinkies (keeping SOS and Bike for a lantern) for a sunset that could be programed as far as time and how it stepped down.
AND, it needs to be easily started. Like at any brightness, do the Sunset click, and the light winks at me to let me know all is well.
Then the light starts stepping down from that brightness according to the arranged program.
No bright flashes while getting there to blind my night vision.

For example my bedside Olight. Love the TIR, Hate the cold white color.
Two clicks from any brightness, and I get a wink. 2 (or3?) minutes later it turns off.
Need more time, 2 more clicks during the time out, and you get 9 minutes(?) before going dark.

For years my bedside light was an old Eternalight. Remember these?

It started out a full brightness – a whopping 15? Lumens.
Every few minutes it would drop one level, and give a little pulse. After a while it would turn off.
The step down let me know that it was going to go dark. And if I wanted more light, I’d better push some buttons.

I think I remember TK once mentioning that the Eternalight was the inspiration for some of her features.
I like the adjustable strobe for flashlights, nifty for freezing motion.

Too timid to reprogram it myself. I’d end up with a brick fro sure.

Still, it’s the best lantern the world has seen to date.
All the Best,
Jeff

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iamlucky13 wrote:
iamlucky13 wrote:
djozz wrote:
I have a request for someone who has experience and is willing to do circuit board drawings and upload it to Oshpark (as I can not do that)

Here is the LT1 ledboard:

….
The request is to draw a commonly from Oshpark orderable frp replacement ledboard for 2×20 standard 3030-size midpower leds, so 20xwarm and 20xcool. If the warm and cool leds can be mixed well (as far as the traces allow), the tint mixing of the lantern will profit.
This makes the LT1 suitable for the entire range of available standard midpower leds, including Optisolis, SunLike, and all the others.
….
Of course if someone dares to have real MCPCB’s for 3030 leds made and sold, that would even be better. But it all starts with the design.

I had a similar idea to this 6 month old post from djozz, and his suggestion is the only post that seems to have turned up in my search.

I just wanted to add that if anybody does this, I’m interested as well – thin FRP or flex PCB from Oshpark, or else an MCPCB in a group buy.

Or perhaps Clemence might be interested? The LH351D’s are pretty good, but I’d love to how the lantern looks with Optisolis or E17A’s in there, and perhaps try a slightly different CCT range.

I guess I’ll bring this up again – I recognize there might simply be no one browsing the thread with the time and skills to design a custom emitter PCB for this lantern as a mod option.

But is anybody else at least interested in alternative emitter options? Usually there’s a decent number of people eagerly looking for even higher color performance than R9050 equivalent and a slight green tint on the cool end. Should we keep a conversation simmering about this or let it go?

I’ve begged them many times to offer a a 4000k and Red XP-E2’s. The red is nice for a “Camping Lantern”, to not attract bugs. I’ve even asked them to send me a board, and I’ll do it myself. Barry said he would send one months ago, but never did

xevious
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You could use a red filter… create something that would wrap around the outside of the translucent cover, so you can remove it when needed.

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A red filter applied on the outside would significantly decrease LT1's overall brightness while red light from XP-E2 LEDs would be much more efficient. I would also love to see an updated or enhanced version of LT1 with either additional XP-E2 photo red (660nm) on the PCB or - taking RobertB's idea into consideration - Sofirn could use LH351D 4.000K 90CRI plus XP-E2 (photo) red and maybe remove the tint ramping feature but use the free space on the MCU for some nice red light modes. Barry was a bit worried what to do with all the XP-E2 photo red that were sourced for C01R - here comes the great opportunity to use them in another fantastic light.

Anyway, I just encouraged Barry to have a look at this idea. He is thrilled about it and would like to discuss further options. I think it's the best to have these options discussed within the LT1 team with Dennis, Lexel, ToyKeeper etc. first to see what's feasible and reasonable.

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DBSAR wrote:
iamlucky13 wrote:

I guess I’ll bring this up again – I recognize there might simply be no one browsing the thread with the time and skills to design a custom emitter PCB for this lantern as a mod option.

But is anybody else at least interested in alternative emitter options? Usually there’s a decent number of people eagerly looking for even higher color performance than R9050 equivalent and a slight green tint on the cool end. Should we keep a conversation simmering about this or let it go?

I do have the original design drawing, but the production one has been changed a little from that.

That’s good to know. If I end up having time to learn a PCB design program, I might be interested in seeing it for reference. Currently, unfortunately, I’ve got too much going on to take on a hobby project.

RobertB wrote:
I’ve begged them many times to offer a a 4000k and Red XP-E2’s. The red is nice for a “Camping Lantern”, to not attract bugs. I’ve even asked them to send me a board, and I’ll do it myself. Barry said he would send one months ago, but never did

That’s an interesting idea. I think it would be good if they are able to offer the board for sale, although since those are emitters with an XP footprint, reflowing the included board is an option.

I wonder if the low forward voltage of the red XP-E2 would cause any issues with mixing. I wouldn’t think so, but I don’t really know.

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Lux-Perpetua wrote:

A red filter applied on the outside would significantly decrease LT1’s overall brightness while red light from XP-E2 LEDs would be much more efficient. I would also love to see an updated or enhanced version of LT1 with either additional XP-E2 photo red (660nm) on the PCB or – taking RobertB’s idea into consideration – Sofirn could use LH351D 4.000K 90CRI plus XP-E2 (photo) red and maybe remove the tint ramping feature but use the free space on the MCU for some nice red light modes. Barry was a bit worried what to do with all the XP-E2 photo red that were sourced for C01R – here comes the great opportunity to use them in another fantastic light.


Anyway, I just encouraged Barry to have a look at this idea. He is thrilled about it and would like to discuss further options. I think it’s the best to have these options discussed within the LT1 team with Dennis, Lexel, ToyKeeper etc. first to see what’s feasible and reasonable.

I see what you mean. Yes, with wanting to maintain maximum output, an external filter would be a detriment. Considering how the auxiliary LED’s appearing in Astrolux, Emisar, and FireFlies has been popular, you’d think a circuit could be designed to allow for auxiliary ones driven at higher amperage in the LT1, allowing for bright red or amber emitters. This way it wouldn’t cut into the existing temperature function of the main emitters. Then in UI you can click over into AUX control, to run independently or even simultaneously with the mains.
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Just received my LT1 and I am impressed! Thank you to Sofirn, DBSAR and everyone involved in developing this lantern. I am a flashlight and headlamp guy and not into lanterns but this lantern is amazing! What a great price too. Wow.

Life’s Questions/Answers here: http://www.answersingenesis.org/home/area/qa.asp “So then, each of us will give an account of himself to God.” Romans 14:12

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Ok, maybe a stupid question

Is there an option for smooth ramping without tint change?
I would like the 2700 K all the way from low to high, for now it starts either warm and ends cool and vice versa

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Yokiamy wrote:
Ok, maybe a stupid question

Is there an option for smooth ramping without tint change?
I would like the 2700 K all the way from low to high, for now it starts either warm and ends cool and vice versa

Sounds like you have auto tint ramping turned on. When the tint reaches the end of its ramp, it will quickly flash to let you know the limit has been reached. If you continue holding, it will flash again indicating that it has entered auto tint ramp mode.

Ramp the tint back up a little (click-click-hold) and then back down to 2700K and let go of the switch as soon as it reaches the end. That should exit auto tint mode.

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Thanx Rayoui!

That’s it! That did the trick.
That part is not directly stated in the flowchart, couldn’t get it from the manual directly.

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I have been off-line for a while with a work change, but I finally got a chance to go camping this weekend. My children (age 20 and 15) stole my LT1. We used it on the picnic table as a family, so I did enjoy it, but I was hoping to use the Lightening mode and bedtime mode. Didn’t get a chance. I was going to wait for the different anodization colors, but I think I’ll just take black at this point.

I have sent Sofirm a Private message requesting my remaining two codes, where are they selling them these days? Amazon? BangGood?

Lazy-R-us

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Lazy-R-us wrote:
… I have sent Sofirm a Private message requesting my remaining two codes, where are they selling them these days? Amazon? BangGood?

Or, you can go direct at https://sofirnlight.com/blf-lt1-lantern-tint-ramping-2700k-5000k-p0123.html

DIY LT1 battery wrap image. "PDF on Google Drive":https://drive.google.com/open?id=1IHIEOi1NXu868IYNCzIM7D2Ulpxchmww

Fresh Sanyo NCR18650GAs already wrapped "for sale HERE":http://budgetlightforum.com/node/69120 if you like.

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Lazy-R-us wrote:

I have sent Sofirm a Private message requesting my remaining two codes,


I would be sort of surprised if Sofirn is still doing codes, its been 8 months since the lantern came out. But if you get one, let us know as I’ve got a 2 or 3 code entries I’ve not used yet.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

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I seem to remember Sofirn saying that anyone who wanted to wait for the coloured LT1s would be able to ask for new codes when they became available?

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Phlogiston wrote:
I seem to remember Sofirn saying that anyone who wanted to wait for the coloured LT1s would be able to ask for new codes when they became available?

This was my understanding also, which is why I haven’t purchased another 3 lanterns yet.

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Old Davo wrote:
Phlogiston wrote:
I seem to remember Sofirn saying that anyone who wanted to wait for the coloured LT1s would be able to ask for new codes when they became available?

This was my understanding also, which is why I haven’t purchased another 3 lanterns yet.

That’s what they said…… still waiting for 2 colored(green/tan) ~~~~~ Beer Beer

Im not a Pessimist …. just an Optimist with a lot of experience


A little John Prine

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