Emisar D4S review

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what a cool light, thanks for the review. can’t wait for it to show up in the store.

ToyKeeper
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djozz wrote:
I like red and warm leds for this better too but..
SKV89 wrote:
However, I don’t want blue LEDs because according to so many scientific articles, being exposed to blue lights at nighttime affects sleep, not good for eyes, and is actually carcinogenic. That’s why the newer Iphones and other smartphones come with blue-light filter options.
.. as a guard of common sense: looking at popular articles without proper references only, this carcinogenic story is repeated everywhere, it has gained a huge following and that of course has its effect on phone companies who want to sell rather than follow the truth. But if you look for an actual scientific background there is some backup for blue light affecting melatonin levels (not a huge effect) but no proven relation whatsoever between blue(ish) light and cancer.

Yeah… the D4S’s blue light isn’t going to give anyone cancer.

Light, in general, tends to make people feel more awake. Particularly blue shades, but blue is also a component of white. The D4S’s 4000+ lumens of white light (of which probably 1000 is blue) are going to have a much bigger effect than half a lumen of glowy blue from the aux LEDs. Or on the low mode, it’s like 0.001 lumens. It’s completely negligible. The brightness is more important than the color. Even a 2700K incandescent bulb emits more blue light than these little aux LEDs.

Most people have at least some wakefulness response to light, but not all. Out of every 20,000 people, about 3 don’t have this response. Of those 3, statistically, 2 are actually blind. And I’m the other one. Because I see just fine, but my iPRGCs don’t work.

If you want a D4S to cause cancer, you’ll have to eat the battery or shine it at your skin point-blank on turbo, every month, repeatedly causing burns on the same place… and I’m not sure if even those would do the trick. But a tiny trickle of blue light is harmless.

ToyKeeper
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cabfrank wrote:
What a great light. The auxiliary LED’s are a fantastic idea. I don’t have any 26650 cells, and I’d worry about the magnet near automatic watches, but other than that, everything about it makes it a must have.

The magnet is optional.

BlueSwordM
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Well, the power you can push in the case of the D4S.

The highest current 21700 can push 35-40A. So, for people like Dale, you can put something like SST40s/Luxeon Vs/XPL2s and push even more power through for like 15 seconds.

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

Tom Tom
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Tesla designed the 21-70 to be optimal for their very specific requirements.

Which may or may not align with what’s optimal for torches or other consumer applications.

Too fat to be applicable to e.g. laptop cells or other stuff. Laptops in particular are going slim and light, with pouch cells.

As is every other EV manufacturer AFAIK. In the next two years the mainstream manufacturers will be launching real world affordable EVs, and no, they won’t be using a big pile of steel cased 71-20s, but big bespoke bagged cells, which pack far better. And can be thermally managed far better.

I sense some bandwagon jumping by those who blindly follow Tesla’s direction. They have built their Gigafactory(ies) based on a certain (bought in) manufacturing process which bought them fast time to market, and are pretty much committed down that path, but history will decide whether that is the best direction for the future. Or whether Tesla make it.

No other mainstream auto manufacturer seems to think so.

Watch this space.

BlueSwordM
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What are you meaning about better thermal management?

It is always easier to cool off smaller cells rather than bigger cells, and battery packs using smaller cells are more reliable.

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

Gebe
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Yay for the strong magnet! Tail light magnets are never strong enough for me and I always have to add an extra one. Nice light!

MascaratumB
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TK, thanks for taking the time to show us how this D4S will become Wink
I’ll wait for the final specs to be disclosed, but what was advanced make me like this light! It will be my first in 26650 format, so I’m curious about it!

BTW, those changes on the UI seem nice and, in some way, more practical than on the D4!
Let’s seen when it finally comes to public Cool

REVIEWS: AMUTORCH: S3 / S3 vs 219c / AM30 / AX1 / VG10 /// SOFIRN: SF14 & SP10A / SP32A / SP10B /// NITEFOX: UT20 / ES10K / K3 /// ODEPRO: KL52 / B108 /// ACEBEAM: H20 /// BLITZWOLF: BlitzWolf BW-ET1 /// DQG: AA Slim Ti /// HC-LIGHTS: SS AAA /// XTAR: PB2 Charger /// OLIGHT: M2R Warrior /// WUBEN: TO10R / E05 / T70 /// ON THE ROAD: M1 / i3 / M3 Pro /// ROVYVON: A2 & A5R / E300S / A8 /// KLARUS: XT1C 

Tricks: 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8  TIR Lenses: 1 / 2   Others: Biscotti 3 & 1*7135     Triple TIR & XP-G2

GIVEAWAY - 1

Herb Tarlek
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alex64 wrote:

Not emptyquoting.

I want a cool white light about as much as I want Cool Ranch Soda.

 

"Gerecht pointed his light. Like us, he was carrying an eyeball-melting flashlight that carried for a long ways. Monster Hunters wanted all the lumens." --Larry Correia, Monster Hunter: Siege

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This looks like it is taking advantage of your Aux LED pin 3 feature of Anduril?

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WOW Love Thumbs Up

Well done Hank! I can’t wait to get my hands on one of those bad boys.

  • Aux LED’s look awesome! LOL I really like the blue. Red might be fun as well. A few options would be cool.
  • I’ve read the magnet is “optional,” does that mean its removable from the tailcap?
  • 26650 battery config is great. Is there going to be a short tube offered for 23650?

Thanks TK for the review!

DB Custom
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Yourrid, pretty sure TK said she got two tailcaps, one with and one without the magnet. Wink

KeepingItLight
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DB Custom wrote:
… I still prefer 26650, for too many reasons to mention…

One thing I like about the 26650 format is the extra room it gives to spread out the LEDs on the MBPCB.

Although, I have never owned an 18650-based triple or quad, I have always been suspicious that the optics on some of those lights are covered a wee bit by the bezel. In practice, I doubt it makes much difference in output, but, hey, every little bit counts.

Thanks for a great review.

will34
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Very cool light! The larger mass should help a lot with temp regulation and extend turbo for quite a bit. I hope to see a 21700 tube for it.

vinte77
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Well there goes the flashlight budget again, gotta have one of these now.

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Tagging to keep track of when they are going to go on sale…

joechina
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Maybe these are the LED choices.
On Int-Outdoor there are new Led-Boards and looking like fitting the D4S. Hi (4000, 5000, 6500K) und Nichia (5000 90CRI)

https://intl-outdoor.com/index.php?main_page=products_new&zenid=54a8ff7b...

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How difficult will it be to exchange these cyan coloured micro-size LEDs by red coloured ones? Are these LEDs hard to get or is it a standard LED that can be bought at Mouser, Arrow, Kaidomain and so on?

I wonder why Hank took cyan/blue LEDs. Red light would be better for maintaining oneself’s night vision ability and – IMHO – looks more fancy like those unaffordable Oveready BOSS lights. Green light would also be a better option for the human eye is most sensitive on the wavelenght of green light (~ 550nm). So, green light even at micro-lumen-level would be far better visible than blue light.

Maybe all this has something to to with John Rambo? Wink

joechina
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Toykeeper:
Has iOS v3 a reset to factory defaults function?

wolfstyle
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Thanks for the review.

cujo255
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This looks great, longer high lumen runtimes than the D4 with more thermal mass. Makes me glad I haven’t snapped up a D4 or a different 26650 light yet so now I can say I need this for two reasons.

DB Custom
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Had to smile, Cujo needs mo powah! Wink

Big Smile

vresto
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hm..but this is not an edc anymore:)

EDC- Jetbeam E40R,Astrolux S43 XPLHI

Headlamp-Thrunite th30

DB Custom
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Why not vresto? A belt sheath will put it at hand at all times and you’ll forget it’s there til you need it. Kydex or Holstex can easily make a horizontal holster to carry it on the belt or the hem of pants or shorts, works very well.

Edit: Know any LEO? Ask them what they carry every day….. come on man, Cowboy Up! Wink

vresto
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for 26650 i would rather buy DN70 or so…for me more practical.but surprised,that this one is so throowy…

EDC- Jetbeam E40R,Astrolux S43 XPLHI

Headlamp-Thrunite th30

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I’ll chime in on this. It helps to have some quick facts about how blue light affects your circadian rhythms:

1. When the sun sets, you have primarily red light in the sky – staring at a bright computer screen at night will delay the onset of sleep. Unless you’re holding the blue LED’s up to your eyes at night they won’t do anything to your sleep patterns. You’re more likely to have disrupted sleep from looking at your phone in bed or otherwise not practicing good sleep hygiene.

2. Blue light doesn’t cause cancer. It’s in the visible spectrum – it doesn’t have the energy required to break DNA strands. UV light does this – this is what causes sunburns and cancer.

I spent a few minutes googling and it sounds like there is an increased risk of prostate cancer from some studies in people chronically exposed to blue light. What does this mean? What it’s NOT saying is that Blue light = cancer. What it IS saying is that if you chronically sleep-deprive yourself or otherwise are stressed over many years, you will have an increased risk of certain cancers. Even then, I didn’t see any actual odds ratio or relative risk or P-values given – so an article could say ‘increased risk’ even if the risk is only increased by .001%.

What I can say for certain is that there is an increased risk of cancer from smoking / tobacco use, chronic daily alcohol use, a family history of cancer, hep B / C, or chronic exposure to sunlight (to name a few).

For what it’s worth, my background is an M.S. in physiology with specialization in ovarian cancer research and I am finishing up my last year of medical school.

Bored med student

DB Custom
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I bought a packet of SMD LED’s in like 8 different colors for less than $10 on ebay. Like 160 LED’s, seriously. Make it whatever color you fancy with a few minutes use of a hot air gun. Wink Mix and match, create your own color spectrum, be imaginative… Smile

Edit: Look, 5 colors… 20 pcs each… 100 SMD LED’s for $7.99 on Amazon

Or on ebay, 500 pcs for $3.49! 100 each in 5 colors!

A single Tritium vial in the smallest 1.5mm x 6mm is ~$7, fwiw. Wink

vinte77
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I wonder if international outdoors or mountain electronics is going to have a driver/firmware to support a clicky version of the sandwich mcpcb.

Tom Tom
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I think these marker LEDs are a great idea, if well done with good efficiency (TK, are you using the trick with the internal pull up, plus an external resistor, to get the various levels from one pin ?).

Tritium vials are neat, but have a 12 year half life, even if the internal phosphor survives that long. Now 12 years might seem like an age, but it’s not. And you’ll notice the dimming long before then.

I have a small collection of British prismatic marching compasses, the most recent ones were surplus stock, sold off because the tritium vials had degraded and it was no longer cost effective to have them re-tritted, as used to be the practice, or they just didn’t need so many anymore.

These things: https://www.silvermans.co.uk/products/prismatic-compass-m-73?variant=419...

My most historic one, from WW1, was given to me by my grandfather and still has it’s radium paint, still glowing, but I keep it very carefully, and it doesn’t come out for use.

Similarly my father’s WW2 Negretti & Zambra pocket compass.

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I really like the flashing through VIAs solution. I hope BLF driver designers will copy this idea in future designs. I really like to see fet+1×7135 drivers for E-switch lights like this and easy swap firmwares.

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