*BLF LT1 Lantern Project* (Post #6078 Lantern GB Price announced!

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BlueSwordM
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No need for something different.

Just go with something that has the best capacity to performance ratio.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

Rusty4x4
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Button top 30q batteries are fine, but a higher capacity battery like the PANASONIC/SANYO NCR18650GA will have better runtimes without reducing output.

Illumenated
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I was thinking of something like the NCRs – needs to be button top though, right?

sbslider
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Illumenated wrote:
I was thinking of something like the NCRs – needs to be button top though, right?

that’s correct

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

CLB
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SIGShooter wrote:
Still time to get your addition lanterns on the list Smile

Thanks, SIGShooter. You’re doing a great job.

I’m already on the list for one (#1591), but would like to bump that up to two, just to further support the project.

Wratz
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Who’s the madman getting 10?!?

EcuBebge
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I would like to add 1 lantern, to make 2 total (#1372)

Nev
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Wratz wrote:
Who’s the madman getting 10?!?

He might regret it if the v2 is even better ,better keep another $500+ spare Cash
dealgrabber2002
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Wratz wrote:
Who’s the madman getting 10?!?

A person that has a big mansion and wants a lantern for each room in case of a black out.

SIGShooter
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Nev wrote:
Wratz wrote:
Who’s the madman getting 10?!?

He might regret it if the v2 is even better ,better keep another $500+ spare Cash
Since the names and quantities are easily gotten from the Interest list by user names.xlsx file linked in post #1 I can tell you it’s osb40000.

Better hurry and sign up for more if you want to beat him out Smile

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BillyBobJoe wrote:
Does anduril allow for secondary/locator led?

Yes, and the lantern already has one. It’s the lighted button. The expected runtime per charge is over a decade. Basically, the power draw is lower than the cells’ self-discharge rate.

Phlogiston wrote:
the lantern may be most efficient at 4000K, since it’ll be at full light output, but running both sets of LEDs at a lower power, more efficient level.

Not really. It has one power channel for warm, and one for cool, using PWM to control brightness. The efficiency shouldn’t change much at all at different brightness levels. However, the cooler tint emitters produce more lumens per Watt than the warmer ones, so if you want to maximize efficiency, use the coldest tint it can make.

DavidEF wrote:
TK already said the light gets brighter in the middle of the ramping between CCT groups, so that pretty much confirms this. Then, TK tweaked the settings to reduce the current at the middle, in order to keep the brightness level the same throughout the CCT ramp. That means you will literally get the same (-ish) amount of light for less current when sitting in the middle of the CCT ramp. I guess I could be remembering wrong, but I thought that’s what she said.

No, I measured that it gets dimmer at 4000K… and I artificially increased it to keep the output relatively flat as tint changes.

The output is controlled on two axes — brightness and tint. The brightness is a value from 0 to 100%, and the tint is a value from 3000K (or 2700K) to 5000K. At either end, that ends up being 100×3000K + 0×5000K, or 0×3000K + 100×5000K. And in the middle, it would be 50×3000K + 50×5000K.

But this made it quite a bit less bright in the middle. So it increases the total brightness by as much as 150% in the middle, to compensate. That means, instead of 50%+50%, it actually runs the middle tint at 75%+75% PWM. The overall power usage is still about the same as 100+0 or 0+100 though.

Internally, the actual PWM curves look like this:

… and the before/after for this correction looks like this. Before, it sagged in the middle… and now it’s not totally flat but it’s at least reasonably close.

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patmurris wrote:
@Toykeeper: is the candle mode custom designed for this two tint light? – two different flickering actions on the two output channels 3000k and 5000k? Not sure whether it is worth the effort but it looks like tempting to make the candle mode polytint somehow…

Did you consider sampling a real candle to infer some kind of brightness stochastic function or frequency set? – just making that up. Using a long sample would be best IMO, but would require too much memory i imagine?

Yes, actually. I adjusted candle mode specifically for this light… and also have been putting it on a table full of actual candles for comparison. It’s not perfect, but it’s not bad either. The overall brightness pattern is random, but it looks like this on a graph:

I also gave it a mode where it can change tint automatically with brightness, which affects all other modes. When used in candle mode, it should give at least a subtle coloration effect, but it’s not very noticeable.

Basically, at each end of the tint ramp, there’s an “auto” mode. One is warm when dim and cool when bright, and the other is cool when dim and warm when bright.

I think the auto-tint thing looks best when using lightning storm mode.

Ssthis
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I am on the list for two, and would like to add 2 for a total of 4 please!

BrianButlerCPA
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Please count me in for one. Thanks!

iamlucky13
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DBSAR wrote:
patmurris wrote:

If as suspected the internal charger keeps charging the cells forever when the lantern is on, running off USB, the cells protection circuit would be a safeguard?

As i do not know if the TP5100 charger chip would actually do that, i think either Toykeeper or Lexel would be more qualified & knowledgeable in that category than i am.

I think leftdisconnected is correct about the protected cells not being a safeguard.

Regarding the prior question, I don’t know the TP5100’s algorithm, but a typical lithium ion charge function would transition from constant current to constant voltage charging once the charge voltage (which is higher than the rest voltage) reaches 4.2V.

At that point, the current the battery draws from the charger starts to slowly decline. Once it falls below the threshold, the charger terminates, and does not restart until either the battery is removed and reinserted, or the voltage falls below an initiate threshold. One datasheet I found for the TP5100 (mostly in Chinese), seems to indicate the termination current is 80mA, and the restart voltage is 0.080V below the charge voltage.

As you speculate, that would mean the LED’s drawing continuous power would cause the charger to stay on indefinitely if left plugged in with the LED’s on. However, the charge current absorbed by the batteries should slowly decline, asymptotically towards 0.

It would likely accelerate battery capacity loss, but I wouldn’t expect it to actually overcharge the cells and create a hazard, as the voltage should stay at 4.2V.

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iamlucky13 wrote:

I think leftdisconnected is correct about the protected cells not being a safeguard.

Regarding the prior question, I don’t know the TP5100’s algorithm, but a typical lithium ion charge function would transition from constant current to constant voltage charging once the charge voltage (which is higher than the rest voltage) reaches 4.2V.

At that point, the current the battery draws from the charger starts to slowly decline. Once it falls below the threshold, the charger terminates, and does not restart until either the battery is removed and reinserted, or the voltage falls below an initiate threshold. One datasheet I found for the TP5100 (mostly in Chinese), seems to indicate the termination current is 80mA, and the restart voltage is 0.080V below the charge voltage.

As you speculate, that would mean the LED’s drawing continuous power would cause the charger to stay on indefinitely if left plugged in with the LED’s on. However, the charge current absorbed by the batteries should slowly decline, asymptotically towards 0.

It would likely accelerate battery capacity loss, but I wouldn’t expect it to actually overcharge the cells and create a hazard, as the voltage should stay at 4.2V.

I could probably test that using a single cell, (one that is well used i have) by connecting the USB charger, turn the lantern on with the cell connected to the lantern as it would normally be, but with a volt & amp meter connected to the cell to see what happen on the meters over time while the lantern is running when the cell reaches its full 4.2 volt charge, (say with the lantern running on a medium mode setting.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

korpzgrinda
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Wratz wrote:
Who’s the madman getting 10?!?

Honestly, this lantern sounds like it will be really helpful in nations that have limited electricity, where there are sometimes daily brownouts and blackouts. If I could afford to, I would buy one (plus batteries) for each of my family’s households that are overseas.

Wratz
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korpzgrinda wrote:
Wratz wrote:
Who’s the madman getting 10?!?

Honestly, this lantern sounds like it will be really helpful in nations that have limited electricity, where there are sometimes daily brownouts and blackouts. If I could afford to, I would buy one (plus batteries) for each of my family’s households that are overseas.

Great point! I guess we sometimes forget the luxury a lot of us live in. Thanks for reminder I should be much more grateful.

patmurris
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ToyKeeper wrote:
patmurris wrote:
@Toykeeper: is the candle mode custom designed for this two tint light? – two different flickering actions on the two output channels 3000k and 5000k? Not sure whether it is worth the effort but it looks like tempting to make the candle mode polytint somehow…

Did you consider sampling a real candle to infer some kind of brightness stochastic function or frequency set? – just making that up. Using a long sample would be best IMO, but would require too much memory i imagine?

Yes, actually. I adjusted candle mode specifically for this light… and also have been putting it on a table full of actual candles for comparison. It’s not perfect, but it’s not bad either. The overall brightness pattern is random, but it looks like this on a graph:

I also gave it a mode where it can change tint automatically with brightness, which affects all other modes. When used in candle mode, it should give at least a subtle coloration effect, but it’s not very noticeable.

Basically, at each end of the tint ramp, there’s an “auto” mode. One is warm when dim and cool when bright, and the other is cool when dim and warm when bright.

I think the auto-tint thing looks best when using lightning storm mode.

That’s most excellent TK! Thanks!
This lantern is breaking new ground in so many ways! Thumbs Up

Digitalbenty
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Interested for 2

Digitalbenty

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I’m in on 1!

First BLF group buy, already psyched! Big Smile

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osb40000
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Friends and family need these, I’ll get some V2 too, it’s only money.

saypat
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osb40000 wrote:
Friends and family need these, I’ll get some V2 too, it’s only money.


BLF’s mantra Silly

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Just bumping up here quickly, after some time AFK. Is the V2 a real thing, or still a fantasy?

Rise and Shine my precious...

Enlightened1
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Please add me for 1 more lantern for a total of 2.

Thank you!

iamlucky13
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Wratz wrote:
Who’s the madman getting 10?!?

I was curious, so I dumped the list in Excel to get a count.

It looks like somebody who is generous and wants his friends and family to have the best.

The runner up is on the list for 8 and wants his pals to be well illuminated in deep, dark, Baja Mexico.

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fneuf wrote:

Just bumping up here quickly, after some time AFK. Is the V2 a real thing, or still a fantasy?


Right now, it’s what we call “vaporware”. It’s a product that is announced but yet to be made. DBSAR has indicated that work on V2 will not commence until after V1 is finished and available for sale. Then again, a lot of the work that went into V1 will obviously carry over to V2. Wink

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

DBSAR
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fneuf wrote:

Just bumping up here quickly, after some time AFK. Is the V2 a real thing, or still a fantasy?

The future V2 or “LT2” will be a more expensive deluxe version, with all the goodies & design of this LT1, but with some added features, as in adding a power-bank feature, possible wireless remote control, built in dawn/dusk timer, motion-on/off sensor, and maybe even an alarm clock. and other classified additions. Cool

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

saypat
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can opener?

Nev
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Cuddly toy ?

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