TK's Emisar D4 review

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Firelight2
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FYI: the current batch of aluminum Emisar D4 at International Outdoors are partially lego-able with the all Titanium D4s.

Their aluminum heads fit on the titanium body tubes.

Eraursls1984
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Firelight2 wrote:
FYI: the current batch of aluminum Emisar D4 at International Outdoors are partially lego-able with the all Titanium D4s.

Their aluminum heads fit on the titanium body tubes.


Were the original batch not lego-able? O saw several Ti with aluminum heads after they came out.
alex64
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Any opinion of the new SST20 led compared to the Nichia and XP-L 5000k?

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I second Alex64’s request. I am interested in any information on the SST20’s in general.

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I’d like a floodier version with XPL; the Nichia doesn’t have enough output and efficiency. Considering the result with the XPL-HD in the D4S, I’d like it in the D4 as well. Should maintain the lumens and drastically spread the beam.

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cclight wrote:
I’d like a floodier version with XPL; the Nichia doesn’t have enough output and efficiency. Considering the result with the XPL-HD in the D4S, I’d like it in the D4 as well. Should maintain the lumens and drastically spread the beam.

You can put the floody optic instead of the regular one. Would that be sufficient?

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I don’t know. I have no idea of lumen and throw with the frosted optics.

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hIKARInoob wrote:
cclight wrote:
I’d like a floodier version with XPL; the Nichia doesn’t have enough output and efficiency. Considering the result with the XPL-HD in the D4S, I’d like it in the D4 as well. Should maintain the lumens and drastically spread the beam.

You can put the floody optic instead of the regular one. Would that be sufficient?


I ordered mine with frosted optics,then got the narrow to swap. I noticed big difference. Almost like 2 different lights. They are both bright, lemons very close.
hank
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Quote:
SST-20 4000K/3000K 95CRI: 3000lm

That’s two different emitters in the same light, for higher CRI?

djozz
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As others have suggested before, It would be so nice if Hank invested in developing a current regulated driver with the D4 user interface. Instead of making these 219C and SST-20 D4’s just hot and inefficient, they could be run in a much more efficient regime, with not that much lower output.
With more and more emitters with extreme low voltages, such regulated driver (perhaps even buck- ) would be an asset for the Emisar brand flashlights.

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Quote:
they could be run in a much more efficient regime, with not that much lower output

That would be outstanding.

PBWilson
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hank wrote:
Quote:
SST-20 4000K/3000K 95CRI: 3000lm

That’s two different emitters in the same light, for higher CRI?

I wondered the same thing but it’s not. It’s two choices and you can see it if you scroll down the page on intl-outdoor to make your selection.

Here’s what I copied and pasted:

Neutral White – SST20 4000K 95CRI
Warm White – SST20 3000K 95CRI

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I wonder if it was feasable to order the D4 or D4S with a 2x2 array of SST20 5.000K with 6500K or 3000K with 4000K. I wouldn't want to mix 65CRI and 95CRI, though.

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djozz wrote:
As others have suggested before, It would be so nice if Hank invested in developing a current regulated driver with the D4 user interface. Instead of making these 219C and SST-20 D4’s just hot and inefficient, they could be run in a much more efficient regime, with not that much lower output.
With more and more emitters with extreme low voltages, such regulated driver (perhaps even buck- ) would be an asset for the Emisar brand flashlights.

All builders could heed the voice of reason and sanity in this ‘sizzle sells’ market.
It is precisely why I use a MecArmy PT16/18 instead of my D4 lights.
Flashy Mike
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djozz wrote:
As others have suggested before, It would be so nice if Hank invested in developing a current regulated driver with the D4 user interface. Instead of making these 219C and SST-20 D4’s just hot and inefficient, they could be run in a much more efficient regime, with not that much lower output.
With more and more emitters with extreme low voltages, such regulated driver (perhaps even buck- ) would be an asset for the Emisar brand flashlights.
I wonder if a buck driver is possible at all. There is really very little height in the driver cavity of the D4. A couple of 7135 would fit though.
Jay
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Lux-Perpetua wrote:

I wonder if it was feasable to order the D4 or D4S with a 2×2 array of SST20 5.000K with 6500K or 3000K with 4000K. I wouldn’t want to mix 65CRI and 95CRI, though.

Yes, it isn’t listed as an option, but Hank will make them upon request.

D4 SST-20
Left: 3000K/4000K mix tint w/ 10623 optic
Right: 4000K w/ 10622 optic

djozz
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Flashy Mike wrote:
djozz wrote:
As others have suggested before, It would be so nice if Hank invested in developing a current regulated driver with the D4 user interface. Instead of making these 219C and SST-20 D4’s just hot and inefficient, they could be run in a much more efficient regime, with not that much lower output.
With more and more emitters with extreme low voltages, such regulated driver (perhaps even buck- ) would be an asset for the Emisar brand flashlights.
I wonder if a buck driver is possible at all. There is really very little height in the driver cavity of the D4. A couple of 7135 would fit though.

This 2200mA buck driver (just new from KD, I bought 2 of these) claims a total height of 8mm. For a D4 type of light you want at least 6A to drive 4 SST-20 leds to a decent output, so a bigger coil is probably needed, adding thickness.

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This buck driver does 5.5A with 6 mm inductor height and 3.5A with 4 mm inductor height:
http://www.international.mtnelectronics.com/index.php?route=product/prod...

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(at the moment)

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Jay wrote:
Yes, it isn't listed as an option, but Hank will make them upon request. !{width:80%}https://i.imgur.com/4ap3a98.jpg!:https://imgur.com/4ap3a98 D4 SST-20 Left: 3000K/4000K mix tint w/ 10623 optic Right: 4000K w/ 10622 optic

That's great news! Thank you Jay! Does he also offer different optics installed upon request? I only know about the 10622 as the standard optic for the D4.

Jay
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Lux-Perpetua wrote:

Jay wrote:
Yes, it isn’t listed as an option, but Hank will make them upon request. D4 SST-20 Left: 3000K/4000K mix tint w/ 10623 optic Right: 4000K w/ 10622 optic

That’s great news! Thank you Jay! Does he also offer different optics installed upon request? I only know about the 10622 as the standard optic for the D4.

He also offers the 10623 floody optic for the D4, which you can find in the regular options when ordering. Throw is reduced, but it makes for a smooth floody beam that’s great for indoor/close range use. For general purpose/edc, I’d stick with the 10622.

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Agro wrote:
This buck driver does 5.5A with 6 mm inductor height and 3.5A with 4 mm inductor height:
http://www.international.mtnelectronics.com/index.php?route=product/prod...
If I recall right even 4mm is very tight but perhaps someone has his D4 currently open and can measure the height of the cavity?
Agro
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Emisars feature very thick shelves. Would a cutout for inductor degrade thermals too much? Especially with current reduction…

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Flashy Mike wrote:
Agro wrote:
This buck driver does 5.5A with 6 mm inductor height and 3.5A with 4 mm inductor height: http://www.international.mtnelectronics.com/index.php?route=product/prod...
If I recall right even 4mm is very tight but perhaps someone has his D4 currently open and can measure the height of the cavity?

TK measured the driver cavity previously. It’s only about 2.5mm deep:

http://budgetlightforum.com/comment/1153972#comment-1153972

With a 4.5mm thick shelf, however, careful machining could hypothetically make a pocket for an inductor. I think even machining all the way through the shelf, as long as you kept the pocket no larger than necessary, would have a reasonably small effect on the heat transfer from the MCPCB to the rest of the body, especially for a 5.5A driver.

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Has anyone ever figured out what the “grainy” finish is on the D4 and D1S lights? Its very unique and I can find no explanation of it anywhere, I have the white D4 and the grey D1S. I guess I want to know out of curiosity.

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Cpeng wrote:
Has anyone ever figured out what the “grainy” finish is on the D4 and D1S lights? Its very unique and I can find no explanation of it anywhere, I have the white D4 and the grey D1S. I guess I want to know out of curiosity.

It’s just anodizing like on pretty much every aluminum light. However, there are different ways of doing anodizing, and the anodizing finish chosen on these lights results in a grainy unpolished finish, rather than the much more common smooth finish.

I have a few lights with a grainy finish like this:

  • White Emisar D4 (quite grainy)
  • Blue Emisar D4 (grainy, but not so much as the white)
  • Sunwayman T26C with tan finish (quite grainy)
  • Yellow Fireflies E07 (quite grainy).
  • Olight S10 Ti bead blasted. It’s not grainy anodizing like the others but has that same grainy chalky feel as the other lights.

Overall, I’m not a fan of the grainy finishes. Feels like I’m holding a stick of chalk. The texture just doesn’t feel good in the hands even though it does noticeably increase grip. I’d much rather have smooth anodizing with knurling for increased grip.

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the finish before ano determines the surface after ano. A polished raw light stays polished and vice versa.

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djozz wrote:
As others have suggested before, It would be so nice if Hank invested in developing a current regulated driver with the D4 user interface. Instead of making these 219C and SST-20 D4’s just hot and inefficient, they could be run in a much more efficient regime, with not that much lower output. With more and more emitters with extreme low voltages, such regulated driver (perhaps even buck- ) would be an asset for the Emisar brand flashlights.

Yes please! Waiting for Hank to use put this in his lights!

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