Emisar D4S review

2439 posts / 0 new
Last post
ToyKeeper
ToyKeeper's picture
Offline
Last seen: 1 hour 18 min ago
Joined: 01/12/2013 - 14:40
Posts: 10809
Location: (469219) 2016 HO3

The HP48 calculator series was particularly interesting. In addition to the usual RPN stuff, the visual graphing stuff, and the symbolic formula manipulation, what made it really special was that it had a hierarchic filesystem. Users could store and organize arbitrary files, create their own library of functions and scripts, even create entirely new software for it to add applications or completely change how the calculator worked. And it had an active community building and sharing neat new things for it.

The main drawbacks were that it was fairly slow and connecting it to a computer was inconvenient. It was no worse about these things than other products at the time, but it sure could have benefited from a faster processor and a USB port.

alchemi
Offline
Last seen: 2 months 4 weeks ago
Joined: 09/01/2018 - 05:55
Posts: 86
Location: London, UK

I need to get some 26650s for the incoming D4S, ideally bought in the UK

I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:

ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40A

I understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)

Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.

Pete7874
Pete7874's picture
Offline
Last seen: 19 hours 21 min ago
Joined: 11/23/2011 - 16:47
Posts: 3480
Location: USA

alchemi wrote:
I need to get some 26650s for the incoming D4S, ideally bought in the UK

I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:

ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40A

I understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)

Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.


Does nkon ship to UK? If so:
https://eu.nkon.nl/rechargeable/26650/ijoy-26650-4200mah-40a.html

That iJoy cell supposedly can deliver lots of current, which is what you want for your D4S light.

ToyKeeper
ToyKeeper's picture
Offline
Last seen: 1 hour 18 min ago
Joined: 01/12/2013 - 14:40
Posts: 10809
Location: (469219) 2016 HO3

FWIW, even with the D4S’s increased thermal mass, turbo is still meant for relatively brief use. Higher-mAh cells work better at the lower, saner levels where the light will most likely spend most of its time. It can, for example, make the difference between 12 hours of runtime and 16 hours of runtime.

Pete7874
Pete7874's picture
Offline
Last seen: 19 hours 21 min ago
Joined: 11/23/2011 - 16:47
Posts: 3480
Location: USA

ToyKeeper wrote:
FWIW, even with the D4S’s increased thermal mass, turbo is still meant for relatively brief use. Higher-mAh cells work better at the lower, saner levels where the light will most likely spend most of its time. It can, for example, make the difference between 12 hours of runtime and 16 hours of runtime.
From that standpoint, would you say a Shockli 5500 would be a good cell to use?
DB Custom
DB Custom's picture
Offline
Last seen: 2 weeks 6 days ago
Joined: 01/13/2013 - 22:28
Posts: 20733
Location: Heart of Texas

Probably the best one to use, maybe the Golisi would perform a little better but it’d be tough to see the difference.

Tom Tom
Offline
Last seen: 2 years 8 months ago
Joined: 09/10/2017 - 08:30
Posts: 1162

alchemi wrote:
I need to get some 26650s for the incoming D4S, ideally bought in the UK

I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:

ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40A

I understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)

Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.

This is not a recommendation, just a heads-up about a potential UK supplier who has already posted on here, offering a 10% discount for BLF members.

http://budgetlightforum.com/node/62419

Offering e.g. a Keepower 6000mAh cell, protected to 30A peak, 20A continuous, which should be plenty.

https://18650.uk/product/keepower-26650-6000mah

Keepower are normally pretty decent. I’ve not heard about this 6000 mAh version before, never-mind the protection circuitry which I would usually avoid, but it might be worth a look.

Tom Tom
Offline
Last seen: 2 years 8 months ago
Joined: 09/10/2017 - 08:30
Posts: 1162

ToyKeeper wrote:
I also made my own RPN-based calculator, for use on my Linux PDA. I never got around to giving it functions for graphing or symbolic algebra, but it was still a handy thing to have around for more basic functions.

You might like RealCalc, if you have an Android device. Well worth paying for the “Plus” version, once you have evaluated it for free.

The skins are well done too.

https://www.quartic-software.co.uk

Probably not enough digits though to suit your idea of basic performance Wink

ToyKeeper
ToyKeeper's picture
Offline
Last seen: 1 hour 18 min ago
Joined: 01/12/2013 - 14:40
Posts: 10809
Location: (469219) 2016 HO3
Tom Tom wrote:
You might like RealCalc, if you have an Android device.

I installed RealCalc and a few others back in 2011 or 2012, but I haven’t used any of them in years. Mostly I just use python’s CLI as a calculator now. Anything without a programming language built in hardly seems worthwhile any more.

tatasal
Offline
Last seen: 4 hours 23 min ago
Joined: 02/15/2012 - 08:40
Posts: 5657
Location: Far East

Pm sent.

Agro
Agro's picture
Offline
Last seen: 10 hours 9 min ago
Joined: 05/14/2017 - 11:16
Posts: 6868
Location: Ślōnsk

Tom Tom wrote:
alchemi wrote:
I need to get some 26650s for the incoming D4S, ideally bought in the UK

I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:

ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40A

I understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)

Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.

This is not a recommendation, just a heads-up about a potential UK supplier who has already posted on here, offering a 10% discount for BLF members.

http://budgetlightforum.com/node/62419

Offering e.g. a Keepower 6000mAh cell, protected to 30A peak, 20A continuous, which should be plenty.

https://18650.uk/product/keepower-26650-6000mah

Keepower are normally pretty decent. I’ve not heard about this 6000 mAh version before, never-mind the protection circuitry which I would usually avoid, but it might be worth a look.


Under the wraps Keeppower 6000 is the same cell as Shockli 5500.
Andrew_Debbie
Offline
Last seen: 7 hours 1 min ago
Joined: 11/18/2017 - 12:36
Posts: 720
Location: Isle Of Anglesey
minim wrote:
. Just discovered this D4S and regret that I didn’t get that instead of the D4.. Is it a big difference so I need both? Might be the wrong place to ask such a question Big Smile

The D4S is bigger. That means longer run times and a somewhat longer time on Turbo before the light ramps down. It has the aux lights which are both cool and useful.

Most of all, it comes in green. Green is the best colour for a flashlight ever.

You need both. Better order that green one now before they are out of stock Smile

(Seriously of course you do not need both. Save your money. oh and don’t tell anyone I said that)

Andrew_Debbie
Offline
Last seen: 7 hours 1 min ago
Joined: 11/18/2017 - 12:36
Posts: 720
Location: Isle Of Anglesey

ToyKeeper wrote:

I installed RealCalc and a few others back in 2011 or 2012, but I haven’t used any of them in years. Mostly I just use python’s CLI as a calculator now. Anything without a programming language built in hardly seems worthwhile any more.

I tried a couple of HP simulators on my phone and quickly deleted them. I either use my 11C, dc or write a program in java or awk.

dc is scriptable and even has conditional execution. It is also possible to do silly things like call dc from an awk script.

djmcconn
djmcconn's picture
Offline
Last seen: 15 hours 5 min ago
Joined: 10/07/2011 - 23:04
Posts: 448
Location: North Carolina

You folks absolutely amaze me. I have no idea what you are talking about but I enjoy the conversation

alchemi
Offline
Last seen: 2 months 4 weeks ago
Joined: 09/01/2018 - 05:55
Posts: 86
Location: London, UK
ToyKeeper wrote:
FWIW, even with the D4S’s increased thermal mass, turbo is still meant for relatively brief use. Higher-mAh cells work better at the lower, saner levels where the light will most likely spend most of its time. It can, for example, make the difference between 12 hours of runtime and 16 hours of runtime.

Thanks, I’ll remember that when I select some cells for the D4S

Agro wrote:
Tom Tom wrote:
alchemi wrote:
I need to get some 26650s for the incoming D4S, ideally bought in the UK

I cannot find a UK seller for the LiitoKala 5000mAh 26650 cell (I don’t count un-recommended sellers from e-bay or amazon), but I can find UK sites I would be willing to buy 26650s from, for:

ShockLI 3500mAh 30A/60A
ShockLi 4300mAh 40A
AWT 4500mAh 20A / 75A
Efest 4200mAh 35A/50A
iJoy 4200mAh 40A

I understand the mAh (bigger is better, if all else is equal I believe)
But I don’t understand the Amp requirement for a D4S, and the description for the above cells (e.g. (20A/ 75A)

Would anyone be able to recommend some cells? I presume I’m going for unprotected flat tops.

This is not a recommendation, just a heads-up about a potential UK supplier who has already posted on here, offering a 10% discount for BLF members.

http://budgetlightforum.com/node/62419

Offering e.g. a Keepower 6000mAh cell, protected to 30A peak, 20A continuous, which should be plenty.

https://18650.uk/product/keepower-26650-6000mah

Keepower are normally pretty decent. I’ve not heard about this 6000 mAh version before, never-mind the protection circuitry which I would usually avoid, but it might be worth a look.


Under the wraps Keeppower 6000 is the same cell as Shockli 5500.

That site was on my list of places to buy from, the others being Ecolux, Torchy (battery boy), and NKON.

The KeepPower are protected —- is the D4S like the D4, where protected cells are too long?

lionheart_2281
lionheart_2281's picture
Offline
Last seen: 4 hours 56 min ago
Joined: 10/25/2012 - 18:32
Posts: 3132
Location: Brisbane, Australia

Wouldn’t max power also trip the protection circuit?

Andrew_Debbie
Offline
Last seen: 7 hours 1 min ago
Joined: 11/18/2017 - 12:36
Posts: 720
Location: Isle Of Anglesey
djmcconn wrote:
You folks absolutely amaze me. I have no idea what you are talking about but I enjoy the conversation

Awk is an ancient programming language created for processing text files. A very short awk program can do some tasks that would take pages in C++ or Java.

ToyKeeper
ToyKeeper's picture
Offline
Last seen: 1 hour 18 min ago
Joined: 01/12/2013 - 14:40
Posts: 10809
Location: (469219) 2016 HO3
Andrew_Debbie wrote:
Awk is an ancient programming language created for processing text files. A very short awk program can do some tasks that would take pages in C++ or Java.

… and anything longer than a very short Awk program is usually best written in some other language. It’s only really good for one-liners these days.

abhinit90
Offline
Last seen: 3 months 3 hours ago
Joined: 05/07/2017 - 10:31
Posts: 129
ToyKeeper wrote:
Andrew_Debbie wrote:
Awk is an ancient programming language created for processing text files. A very short awk program can do some tasks that would take pages in C++ or Java.

… and anything longer than a very short Awk program is usually best written in some other language. It’s only really good for one-liners these days.


awk is magic indeed
Pete7874
Pete7874's picture
Offline
Last seen: 19 hours 21 min ago
Joined: 11/23/2011 - 16:47
Posts: 3480
Location: USA

alchemi wrote:
The KeepPower are protected —- is the D4S like the D4, where protected cells are too long?
Maximum battery length that D4S will accept is 69mm, according to specs, if that helps.
The length of that KeepPower cell on that 18650.uk site is listed as 60.3mm, which is obviously wrong.
manithree
manithree's picture
Offline
Last seen: 2 hours 24 min ago
Joined: 01/12/2013 - 01:08
Posts: 603
Location: Orem, UT, USA
Tom Tom wrote:
You might like RealCalc, if you have an Android device. Well worth paying for the “Plus” version, once you have evaluated it for free.

I still like Droid48 when I’m not at a computer for a quick calculation.

My 11C got me through my senior year of HS, and all of college. As an “accepted into grad school” gift to myself I bought a 48G, and I just barely used it enough to get accustomed to the UI.

The Burgh
The Burgh's picture
Offline
Last seen: 8 months 1 week ago
Joined: 02/07/2014 - 18:12
Posts: 378
Location: Great Pacific Northwest, USA

Anyone still have a functioning Bomar Brain?

There will always be more darkness than I have lights.

Tom Tom
Offline
Last seen: 2 years 8 months ago
Joined: 09/10/2017 - 08:30
Posts: 1162

alchemi wrote:
We should really start a calculator thread… but

This is what I used in school — count them digits!

Later I had an HP-15C — a lovely calculator. I sold it on e-bay some years ago because I was not using it, and it needed to go somewhere where it would be appreciated more. My mobile has some RPN calculators on it, even some the look like the HP-15C, but I don’t use calculators these days and instead fire up Excel even for simple tasks.

Back on topic: I’ve ordered the D4S with Neutral White – XP-L HI V2 5D, 4000K .

Those Casios with the miniature Nixie tube display were just great. Apart from battery life. They also had a couple of Easter-Eggs embedded too. If I could remember the keystrokes I’d tell you.

A proper HP has a proper red LED display, sadly my best one is bust, I think the Eprom just faded away. Perhaps because it was kept beside several, properly enclosed, radiation sources Facepalm

Something worth noting for those who assume that e.g. Flash memory is magically permanent, it’s really just a few (very few nowadays) electrons, captured in a few thousand, or hundred, molecules of SiO2. Amazing that it works at-all.

Nevertheless all my important devices have been upgraded to SSD (good ones) and the slow spinning rust is kept for cold storage.

Will your torches with microcontrollers still work in e.g. 20 or 30 years time ? Maybe, maybe not. I do have a few with purely analogue, discrete component drivers, which could be eternal, but I’ll probably be dead before I find out.

ToyKeeper
ToyKeeper's picture
Offline
Last seen: 1 hour 18 min ago
Joined: 01/12/2013 - 14:40
Posts: 10809
Location: (469219) 2016 HO3
Tom Tom wrote:
Something worth noting for those who assume that e.g. Flash memory is magically permanent, it’s really just a few (very few nowadays) electrons, captured in a few thousand, or hundred, molecules of SiO2.

There was a bug on the first batch of Convoy’s new drivers which, after calculating the scale of the chips involved, worked out to having a few hundred atoms flipped the wrong way. Basically, the SRAM decays to its default state when power is removed, and that state depends on the orientation of the atoms in the SRAM memory cells. If a few specific bits had enough atoms rotated in the less-popular direction, it would decay to a value which caused problems.

So people returned products for refund or replacement, and justifiably so. Because, totally at random, if they were unlucky enough to have a few hundred atoms out of place, it didn’t work right.

As soon as we discovered the issue, I updated the code to take a larger sample, which dramatically reduces the chance of that happening. But due to the nature of these things, the chance is still non-zero.

Coscar
Coscar's picture
Offline
Last seen: 1 hour 44 min ago
Joined: 01/03/2016 - 20:16
Posts: 795
Location: Gulf Coast
ToyKeeper wrote:
But due to the nature of these things, the chance is still non-zero.

No need for concern for yall tho …. that 1 in a million is reserved for me Facepalm

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


A little John Prine

Gee858eeG
Offline
Last seen: 1 month 2 weeks ago
Joined: 08/31/2016 - 17:26
Posts: 25
Location: Germany

I think the following tiny bug has not been mentioned before.
My D4S Nichia does not always save moonlight into memory.

Procedure to replicate: Light is off. Unscrew and screw again the tailcap to reset memory. Click and hold to start at moonlight. Release quick enough before (!) it starts ramping. Let it on as long as you wish. Switch off by a single click. Switch on again with a single click. Now the light starts at the power level from the reset state (when tailcap was screwed).

It actually just doesn’t save moonlight into memory with the above mentioned procedure. So the light might even start in turbo if that is the last used level.
If you just have the light on and ramp it fully down to moonlight, the level will be saved into memory flawlessly.

Maybe it’s just my model or maybe it’s not a bug, but a feature? Smile

Nonetheless great UI and a great Light. Loving it Smile

bansuri
Offline
Last seen: 1 hour 45 min ago
Joined: 01/30/2017 - 23:43
Posts: 541
Location: Land of Lincoln

Gee858eeG wrote:
I think the following tiny bug has not been mentioned before.
My D4S Nichia does not always save moonlight into memory.

Procedure to replicate: Light is off. Unscrew and screw again the tailcap to reset memory. Click and hold to start at moonlight. Release quick enough before (!) it starts ramping. Let it on as long as you wish. Switch off by a single click. Switch on again with a single click. Now the light starts at the power level from the reset state (when tailcap was screwed).

It actually just doesn’t save moonlight into memory with the above mentioned procedure. So the light might even start in turbo if that is the last used level.
If you just have the light on and ramp it fully down to moonlight, the level will be saved into memory flawlessly.

Maybe it’s just my model or maybe it’s not a bug, but a feature? Smile

Nonetheless great UI and a great Light. Loving it Smile

Try either holding it down longer or ramping up slightly then back down.
If it’s important that you absolutely start on moonlight just hold down the button a microsecond longer rather than clicking it. Pretty simple.
If it happens to go up a level then click click/hold to force it to ramp downward.

Gee858eeG
Offline
Last seen: 1 month 2 weeks ago
Joined: 08/31/2016 - 17:26
Posts: 25
Location: Germany

Yea, thank you. I do this workaround already. Just wanted to mention this behavior so it is recognized and can be fixed in future UI revisions

ToyKeeper
ToyKeeper's picture
Offline
Last seen: 1 hour 18 min ago
Joined: 01/12/2013 - 14:40
Posts: 10809
Location: (469219) 2016 HO3
Gee858eeG wrote:
I think the following tiny bug has not been mentioned before. My D4S Nichia does not always save moonlight into memory. … Maybe it’s just my model or maybe it’s not a bug, but a feature? Smile

Indeed, that is not a bug. It was added on purpose because people wanted it. The memory only remembers the last level the user ramped to. Going to a level via shortcut, like moon-from-off or double-click-for-max, does not change the memorized level.

To make it remember a level, including moon, the user must ramp to it instead of using a shortcut.

Gee858eeG
Offline
Last seen: 1 month 2 weeks ago
Joined: 08/31/2016 - 17:26
Posts: 25
Location: Germany

That explains it. Thanks Smile

Pages