TK's Emisar D4 review

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RotorHead64
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Great review of a great light TK Thumbs Up .

Hank, we want:

From off:

• 1 click : turn on in last used mode.

TK, doesn't press and hold already start at the lowest mode setting?

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These look awesome!!!! Thumbs UpCoolThumbs Up

When will they be available for purchase?

If those are prototypes and the design is still open to changes only things I’d suggest would be knurling on the 18650 battery tube and maybe some kind of raise ring around the button to reduce chance of accidental pocket activation.

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For a ramping UI, something like DrJones lumodrv worked fairly well. Lumodrv had the following UI:

  • long click from off – minimum power, then starts ramping up.
  • Short click from off – last used mode
  • Click and hold from on – ramp up. Repeat to switch the direction of the ramp.
  • Double-click form off or on – turbo
  • Triple-click from off – 20%
  • Hidden strobe modes – ramp all the way to max, then continue holding for a couple seconds to access strobe modes.
  • Momentary mode – ramp down to min and continue holding. Light enters momentary mode (disconnect battery to exit).
  • Single click from on once light has been on 2 seconds – off

Lumodrv was almost perfect. But a few changes would be nice:

  • Ramping should set a memorized mode which could be accessed from a short click from off. This mode should not be overridden by using the moonlight or turbo shortcuts.
  • When clicking and holding to start in minimum power mode, it would be nice if the light paused for 1 second before starting to ramp up.
  • Turning off the light from on requires the light to have been on for 2 seconds. That is a bit long. Change to 1 second.
ToyKeeper
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RotorHead64 wrote:
TK, doesn’t press and hold already start at the lowest mode setting?

Yes, it does. That’s why I want a single click to go to a memorized mode instead — it doesn’t need two shortcuts to moon.

Firelight2 wrote:
  • When clicking and holding to start in minimum power mode, it would be nice if the light paused for 1 second before starting to ramp up.
  • Turning off the light from on requires the light to have been on for 2 seconds. That is a bit long. Change to 1 second.

The D4 already does both of these. I think the timing is slightly shorter in both cases though — about 2/3rds of a second.

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Another small update:

Protected cells likely won’t fit. It looks like the maximum cell length is about 67 mm.

I wanted to try an old protected NCR18650A for lulz, but it’s too big. So, use unprotected cells or short protected cells (with a high amp limit, at least 15-20A).

PBWilson
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Dang! I can’t wait to get back home from this trip to start using my new D4 that Richard has sent! Understanding that I’m at the beach for a week oughta tell you that I’m excited to get my hands on my nichia/green light.

Thanks for all the info and for your thoughts. I’m not so worried about not having memory. I use my lights at all sorts of levels from very high to very low and not exactly knowing if I’ve last used it for reading and not disturbing the wife at night or used to to check for skunks at night when taking my pooches out to do their business could lead to some confusion.

All in all, this appears to be a high-tech and well thought out light for a very nice price. $35 is quite a bargain for all this performance (and cool looks to boot!).

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PBWilson wrote:
All in all, this appears to be a high-tech and well thought out light for a very nice price. $35 is quite a bargain for all this performance (and cool looks to boot!).

That’s right! Cool
And this is just the D4 with 4 emitters… Can’t wait for the D7… Evil

A little flashlight 1 on 1:

Green tint = bad
Green light = good

I think I’m gonna call it the Little Hulk. Big Smile

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I did some thermal tests. Details in comment #1.

Short version: It gets too hot, because it takes too long to reach a stable state. I’ll be fixing that.

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Hi TK, made some comments to your reply on RMM thread which I probably should have brought here instead, re: TM being non existent as far as I can tell.
I leave those there and delete them I guess in a couple hours to keep R’s thread clean, I don’t think he would interested to hear of any issues right now, or none issues, not sure really,
I know when I should turn down a light due to heat … ha ha ha, ouch..

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Sorry, but i had to:

I vote for the middle one.

Looking for:

5” parabolic reflector (for recoil light)

T18
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I was wondering TK if a video of that huge drop from Turbo to moon in 5 seconds or so would be of any help.
Is that considered defective, should I say something to Richard about this, I’m certainly able to make the light do what I want it for but wondering what he will tell others if they start asking, or maybe you can tell him and it would be better explained I imagine.
Really just an opinion of course but the only light that would definitely benefit from T.M. and mostly for safeties sake and the inexperienced customers would be that XPL’s, that light gets very hot very fast,
I also agree that last mode mem would be another fantastic feature, have found myself now just double clicking to turbo and then ramping down to my comfort level.
Let me know if a vid helps any, I’d be happy to do that if that’s helpful in someway.

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I’ve only heard of one light doing the turbo-to-moon thing. I’m not sure if it’s a design issue or a fluke.

AEDe
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Please, measure the driver space.

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More updates:

This is what the shelf looks like under the MCPCB. It’s covered in thermal goo:

The driver comes out with a bit of force from the inside, and it still works afterward when held in place only by pressure. Here’s what it looks like:


To get the driver out:

  • Unscrew and remove the bezel.
  • Pop the optics out. Hopefully it isn’t glued to the MCPCB, but if it is, this step could be tricky.
  • Unsolder the red and black wires.
  • Pull the MCPCB out.
  • Carefully push on the driver with a plastic rod like a spudger.

To get the driver back in, you may need to file down the edges of the driver a tiny bit. I did, because the glue around the edge made it slightly too wide.

The driver is 22.3 mm in diameter.

The shelf under the MCPCB is 4.5mm thick. Thumbs Up

I think it may be giving me the finger, to protest being separated from its home.

Good news about the anodizing. I accidentally scraped part of my light with a bastard file while filing the edge of the driver, and after wiping the driver dust off I can’t even see where I scraped it. So the anodizing seems pretty tough.

Also, Narsil works on the D4 without any code changes. I flashed NarsilM.hex from the repository, and it just works. Moon appears to be significantly lower, too — about the same as my ZL SC52, or 0.1 lm. I haven’t actually measured it yet, but it looks pretty close.

However, runtime on moon isn’t dramatically longer. The driver seems to use about 4.5mA even without the LEDs on, so the absolute longest it could possibly run is about 28 days on a 3000 mAh cell.

I did a very low-tech runtime test to see what the curve looks like and make sure LVP works. To speed things up, I used an 18350 cell and did not recharge it first. I measured the output at 285 lm in my light box, then moved the light over to my runtime test setup. Note, the battery was not full; I had been using it since the previous evening and I think it was at about 3.9V or 4.0V. It didn’t really matter for this purpose. I also bumped the table a bit during the test, which made some small bumps in the graph.

What this shows is:

  • LVP works. It goes directly to moon in one step though, instead of doing a more progressive step-down.
  • Output on this mode, which was about 350mA on the 7135 chip and 350mA on the FET, has a gradual decline as expected.
  • I was too impatient to wait for the light to turn off completely, so I ended the test when I noticed it had stepped down to the lowest level.

My “test setup” was pretty ad-hoc. It looked like this:

AEDe
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Could you measure d and h of
the cavity in which the driver is located, please?

AlexLED
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Thanks, TK for the detailed review !!

hIKARInoob wrote:
But in all honesty, I have the feeling that a fundamental function is missing: press and hold from off leads to last (memory) output. This is like the divine three of a flashlight, especially with an EDC; instant access to lowest, highest and memory from off. Maybe I have overlooked something?

Fully agree !!
Figure, you’re using it during the day, meaning you need a fairly amount of light, but want to turn it off and on several times, you would always need to pay attention to release the switch at the desired level. Sad

Although I really prefer non-memory most of the time, I appreciate being able to optionally activate memory.

Of course, flashaholics probably will have (at least) one light with and another without memory. Wink

Regards,
Alex

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Great review TK.
I must have a green one with 18350, it’s so cute.

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Nice green. Shame it’s all glued. Looks nice though…

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Cell ground goes to the driver trough battery tube end?

Meanwhile in Russia: https://twitter.com/CrazyinRussia

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Does anyone know if this one will be available elsewhere? Shippingcost is making this less interesting for me.

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Geuzzz wrote:
Does anyone know if this one will be available elsewhere? Shippingcost is making this less interesting for me.

Intl-outdoor will sell it was well (should be free shipping to NL), so don’t worry.

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hIKARInoob wrote:
Geuzzz wrote:
Does anyone know if this one will be available elsewhere? Shippingcost is making this less interesting for me.

Intl-outdoor will sell it was well (should be free shipping to NL), so don’t worry.

Thanks! Will wait for that. Thumbs Up

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Geuzzz wrote:
hIKARInoob wrote:
Geuzzz wrote:
Does anyone know if this one will be available elsewhere? Shippingcost is making this less interesting for me.

Intl-outdoor will sell it was well (should be free shipping to NL), so don’t worry.

Thanks! Will wait for that. Thumbs Up

Cheers! Beer

In case you didn’t know, Hank Wang (member here as well) is the man behind Noctigon and Emisar, and Intl-outdoor is his business. The firmware for the D4 is most likely adapted now before he starts selling them on his site.

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The output on this 18350 2 1/2” light is insane!

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chooma wrote:
The output on this 18350 2 1/2” light is insane!

I know, right? I didn’t know one could get 2800 lm from an 18350 cell. At first I thought I did the measurement wrong.

… and I don’t even have those fancy new Aspire cells yet. I’ll have to get some, when they’re slightly easier to obtain. They make the shorty version of this light rather practical, even for pretty long nights.

On a related note, the springs are holding up unexpectedly well. Even after running at the maximum brightness with my highest-amp cell for thermal testing, the springs don’t appear to be sagging at all. Hank must have sourced some unusually good springs.

I’m surprised I haven’t damaged anything yet, testing this thing with thermal regulation disabled. It was so hot that I nearly burned myself just pressing the rubber button to turn it off.

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ToyKeeper wrote:
On a related note, the springs are holding up unexpectedly well. Even after running on the maximum brightness with my highest-amp cell for thermal testing, the springs don’t appear to be sagging at all. Hank must have sourced some unusually good springs.

I was under the impression that those springs are identical to that of the M43, see post #213: http://budgetlightforum.com/node/20891?page=7

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The dark purple Efest 18350 will deliver the most current, the Aspire does ok and of course has longer run time, just doesn’t give maximum output.

Wondering what this little green meanie would be like with Nichia 319’s? Wink

Dale

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AEDe wrote:
Could you measure d and h of the cavity in which the driver is located, please?

Next time I take it apart. It’s pretty shallow though; barely enough room for the tiny85 chip to fit. Something like this is way too big; even the capacitors may be too thick:

kiriba-ru wrote:
Cell ground goes to the driver trough battery tube end?

Yes. The only reason the driver needs any contact with the pill is for thermal measurement. The pill has no electrical contact.

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I have the Aspire cells and switched to the Efest purples with the XPL Hi and crude burnt my stupid fingers in under a minute, just set it down and reached for something and turned around and picked up the light and that’s it burnt toasty fingers big time, the other two can run on turbo for a long time after you figure out how to keep it on Turbo, drops like a rock to moon in about 5 seconds but a single click will push it back to turbo and it will stay if you don’t ramp down even a 1/2 percent then try and go back up to turbo, it will just drop again.
Will need to tell R. about this and see if I can ship them back to be reflashed with Narsil like TK did..? Sort of annoying.

Edit: I tried to pull the spring and board out of the tail and it must be glued, but the springs are rock solid IMO, put in a protected and cranked on the tail cap and head as hard as possible to see if I could make a connection and couldn’t but the springs held up, put in a copper crush washer in the tail and a protected cell pany will work and not show threads. The tail end of the battery tube threading is not consistent, had they made the threading one more maybe two complete turns protected cells would work I think, but as they are now looking at the three tail caps they are all three at different angles with the branding, drives me nuts, anal something I guess, has to be dead on or it bugs me.

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AEDe wrote:
Could you measure d and h of the cavity in which the driver is located, please?
Aa you can see, slim one-side fet-based board contacts shelf from the one side and cell from the other. There is even no way to add extra 7135 over stock one.
ToyKeeper wrote:
kiriba-ru wrote:
Cell ground goes to the driver trough battery tube end?

Yes. The only reason the driver needs any contact with the pill is for thermal measurement. The pill has no electrical contact.


Cheap and easy solution. Im not sure in pcb copper layer friction abilities, if they decided to exclude retaining ring, they could at least add thick (in comparation with 0.35mil cu layer) brass ring soldered to the driver.

Meanwhile in Russia: https://twitter.com/CrazyinRussia

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